Document And Entity Information Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity a Well-known Seasoned Issuer? Is Entity a Voluntary Filer? Is Entity's Reporting Status Current? Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] Assets [Abstract] ASSETS Assets: Current Assets Cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Restricted cash Short-term investments Short-term investments Accounts receivable - trade, net of allowance of $51 and $51, respectively Accounts receivable - trade, net of allowance of $31, respectively Inventories Inventories Inventories Prepaid expenses and other current assets Assets, Current Total current assets Cash restricted for construction in progress Cash restricted for construction in progress Property, plant and equipment, net of accumulated depreciation of $37,980 and $37,980, respectively Property, plant and equipment, net Property, plant and equipment, net of accumulated depreciation of $54,000 and $49,175, respectively Land use rights, net Intangible assets, net Deferred income tax assets Deferred income tax assets Other assets, net Assets TOTAL ASSETS LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities Long-term Debt, Current Maturities Current portion of notes payable and long-term debt Accounts payable Bank acceptance payable Bank acceptance notes outstanding Bank acceptance notes Accrued Income Taxes Accrued income taxes Accrued liabilities Accrued liabilities Total accrued liabilities Liabilities, Current Total current liabilities Notes payable and long-term debt, less current portion Notes payable and long-term debt, less current portion Long term portion of notes payable and long-term debt Liabilities TOTAL LIABILITIES Stockholders' equity: Common Stock; 45,000 shares authorized at $0.001 par value; 16,839 and 16,839 shares issued and outstanding at December 31, 2016 and 2015 respectively Common Stock; 45,000 shares authorized at $0.001 par value; 18,984 and 18,400 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively Additional Paid in Capital Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net of Tax Accumulated other comprehensive gain Retained Earnings Accumulated Deficit Accumulated deficit Stockholders' Equity Attributable to Parent Ending balance, value Beginning balance, value TOTAL STOCKHOLDERS' EQUITY Liabilities and Equity TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Allowance for Doubtful Accounts Receivable Allowance for doubtful accounts Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation and amortization Accumulated depreciation Preferred Stock par value Preferred Stock shares authorized Preferred Stock shares issued Preferred Stock shares outstanding Common stock par value Common stock shares authorized Common stock shares issued Common stock shares outstanding Income Statement [Abstract] Revenue, net Revenues Cost of goods sold Gross Profit Gross profit Operating Expenses [Abstract] Operating expenses Research and development Research and development Sales and marketing General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Income from operations Other income (expense) Investment Income, Interest Interest income Interest Expense Interest expense Amount of income (expense) related to other nonoperating activites classified as other in the other income (expense) classification. Other Nonoperating Income Expense Other Other income (expense), net Other income and expense, net Other income (expense), net Total other income (expense) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income(loss) before income taxes Income tax benefit Income tax (expense) benefit Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) Net income (loss) per share Basic Net income (loss) per share basic Basic Diluted Net income (loss) per share diluted Diluted Weighted Average Number of Shares Outstanding, Basic Weighted average shares used to compute net income (loss) per share: basic Basic Weighted Average Number of Shares Outstanding, Diluted Weighted average shares used to compute net income (loss)per share: Diluted Diluted Statement of Comprehensive Income [Abstract] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Gain on foreign currency translation adjustment, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) Stockholders? Equity Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common stock Additional Paid In Capital [Member] Additional paid-iIn capital Accumulated Other Comprehensive Income [Member] Accumulated other comprehensive gain (loss) Retained Earnings [Member] Accumulated deficit Shares, Outstanding Ending balance, shares Beginning balance, shares Issuance of common stock, net shares Common stock, shares Stock sold new, shares issued Issuance of common stock, net value Public offering of common stock, net, value Stock options exercised, shares Exercised Stock options exercised, value Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Issuance of share under equity plans, value Stock Issued During Period, Shares, Share-based Compensation, Gross Issuance of shares under equity plans, in shares Stock based compensation Cumulative Effect on Retained Earnings, Tax Cumulative effect of previously unrecognized tax benefits (Loss) gain on foreign currency translation adjustment, net of tax Foreign currency translation adjustment Adjustments to Additional Paid in Capital, Other Net income Net income (loss) Statement of Cash Flows [Abstract] Operating activities: Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Provision for obsolete inventory Lower of cost or market adjustment Depreciation and amortization Depreciation and amortization Increase in deferred tax asset Deferred income taxes, net Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss on disposal of assets Share-based compensation expense Total share-based compensation expense Share-based compensation Unrealized foreign exchange (gain) loss Unrealized foreign exchange loss Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, trade Increase (Decrease) in Inventories Inventories Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Income Taxes Payable Accrued income taxes Increase (Decrease) in Accrued Liabilities Accrued liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Investing activities: Payments to Acquire Short-term Investments Purchase of short-term investments Maturities of short-term investments Maturities of short-term investments Increase (Decrease) in Restricted Cash and Investments for Operating Activities Change in restricted cash for construction in progress Payments to Acquire Property, Plant, and Equipment Purchase of property, plant and equipment Proceeds from disposal of equipment Increase (Decrease) in Deferred Charges Deposits and prepaid charges Payments to Acquire Intangible Assets Purchase of intangible assets Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Financing activities: Proceeds from issuance notes payable and long-term debt Repayments of Debt Principal payments of long-term debt and notes payable Proceeds from line of credit borrowings Proceeds from line of credit borrowings Repayments of Lines of Credit Repayments of line of credit borrowings Proceeds from bank acceptance payable Proceeds from bank acceptance payable Repayments of Bank Debt Repayments of bank acceptance payable Repayments of Notes Payable Repayments of notes payable Increase (Decrease) in Restricted Cash Decrease (increase) in restricted cash Exercise of stock options Exercise of stock options Payments Related to Tax Withholding for Share-based Compensation Tax withholding related to release of restricted stock Proceeds from common stock offering, net Proceeds from common share Proceeds from common stock offering, net Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Effect of exchange rate changes on cash Effect of exchange rate changes on cash Cash and Cash Equivalents, Period Increase (Decrease) Net increase in cash Supplemental disclosure of cash flow information: Cash paid for received from Cash Paid For Received From Cash paid for: Interest, net of capitalized amounts Interest Organization, Consolidation and Presentation of Financial Statements [Abstract] Description of Business Description of Business Accounting Policies [Abstract] Significant Accounting Policies Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Net income per share Earnings Per Share Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Inventories Property, Plant and Equipment [Abstract] Property, Plant and Equipment Property, Plant & Equipment Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets, net Debt Disclosure [Abstract] Notes Payable and Long-Term Debt Payables and Accruals [Abstract] Accrued Liabilites Accrued Liabilities Other Income and Expense Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Compensation Share-Based Compensation Equity [Abstract] Stockholders' Equity Segment Reporting [Abstract] Geographic Information Subsequent Events [Abstract] Subsequent Events Interim Financial Statements Interim Financial Statements Policy Text Block Interim Financial Statements Use of Estimates Recent accounting pronouncements Recent Accounting Pronouncements Schedule of assets and liabilities at fair value Computation of basic and diluted net loss per share Schedule of potentially dilutive securites Schedule of inventories Schedule of property, plant and equipment Schedule of Finite-Lived Intangible Assets [Table Text Block] Intangible assets Schedule of notes payable and long-term debt Maturities of notes payable and long-term debt Schedule of accrued liabilities Schedule of other income and expense Summary of option activity Summary of RSU activity Summary of RSU/RSA activity Schedule of employee stock-based compensation expenses Revenue from External Customers by Geographic Areas Revenue information by geographic region Long-lived Assets by Geographic Areas [Table Text Block] Long-lived assets by geographic region Windfall tax benefits unrecognized Windfall tax benefits unrecognized Windfall tax benefits Cumulative Effect on Retained Earnings, Net of Tax Retained earnings Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Inputs Level1 [Member] Level 1 [Member]