Consolidated Balance Sheets Consolidated Balance Sheets [Abstract] Assets Assets [Abstract] Current assets: Current assets: [Abstract] Cash and cash equivalents Marketable securities Accounts receivable, net of allowance for doubtful accounts of $152 and $82, respectively Inventories Deferred income taxes Prepaid expenses and other current assets Total current assets Property and equipment, net of accumulated depreciation of $17,406 and $15,767, respectively Goodwill Other intangible assets, net of accumulated amortization of $3,658 and $3,203, respectively Deferred income taxes Other assets Total assets Liabilities and Shareholders’ Equity Liabilities and Shareholders’ Equity [Abstract] Current liabilities: Current liabilities: [Abstract] Short-term debt Accounts payable Accrued liabilities: Accrued liabilities: [Abstract] Employee compensation Income taxes payable Other accrued liabilities Total current liabilities Other liabilities Total liabilities Shareholders' equity: Shareholders' equity: [Abstract] Common stock, $.01 par value, 40,000,000 shares authorized, 24,334,515 and 24,213,467 shares issued and outstanding Additional paid-in capital Accumulated deficit Accumulated other comprehensive income Nil coupon perpetual loan notes Total shareholders' equity Total liabilities and shareholders' equity Allowance for doubtful accounts Accumulated depreciation Accumulated amortization Common stock, par value (in Dollars per share) Common stock, shares authorized (in Shares) Common stock, shares issued (in Shares) Common stock outstanding (in Shares) Consolidated Statements of Operations Consolidated Statements of Operations [Abstract] Revenues Costs and expenses: Costs and expenses: [Abstract] Cost of sales Selling, general and administrative Gain on revaluation of ACT liability Research and development Operating income (loss) Interest expense Interest income Other expense Income before income taxes Income tax (expense) benefit Net income (loss) Net income (loss) per common share: Net income (loss) per common share: [Abstract] Basic (in Dollars per share) Diluted (in Dollars per share) Weighted-average number of common shares outstanding: Weighted-average number of common shares outstanding: [Abstract] Basic (in Shares) Diluted (in Shares) Consolidated Statements of Cash Flows Consolidated Statements of Cash Flows [Abstract] Operating Activities Operating Activities [Abstract] Net income (loss) Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to reconcile net income (loss) to net cash provided by operating activities: [Abstract] Depreciation Amortization (Gain) loss on equipment disposals Gain on revaluation of ACT liability Deferred income taxes Stock based compensation Bad debt expense Changes in operating assets and liabilities: Changes in operating assets and liabilities: [Abstract] Accounts receivable Inventories Prepaid expenses, other current assets and other noncurrent assets Accounts payable Accrued liabilities and other noncurrent liabilities Net cash provided by operating activities Investing Activities Investing Activities [Abstract] Decrease in restricted cash Proceeds from the sale of equipment Purchases of property, equipment and patents Net cash (used in) investing activities Financing Activities Financing Activities [Abstract] Proceeds from exercise of stock options Payments on debt Redemption of nil coupon loan note Net cash provided by (used in) financing activities Effect of exchange rate fluctuations on cash Net increase in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Note A - Nature of Business Nature of Operations [Text Block] Note B - Basis of Presentation Basis of Accounting [Text Block] Note C - Revenue Recognition Policy Revenue Recognition, Policy [Policy Text Block] Note D - Cost of Sales Cost of Sales, Policy [Policy Text Block] Note E - Selling, General and Administrative Expenses Selling, General and Administrative Expenses, Policy [Policy Text Block] Note F - Marketable Securities Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Note G - Earnings per Share Data Earnings Per Share [Text Block] Note H - Total Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Note I - Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Note J - Debt Debt Disclosure [Text Block] Note K - Business Segment and Geographic Disclosures Segment Reporting Disclosure [Text Block] Note L - Contingencies Commitments and Contingencies Disclosure [Text Block] Note M - Income Taxes Income Tax Disclosure [Text Block] Note N - Goodwill and Other Intangibles Goodwill and Intangible Assets Disclosure [Text Block] Note O - Fair Value Fair Value Disclosures [Text Block] Note P - Recently Adopted and Pending Accounting Pronouncements Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Scenario, Unspecified [Domain] Statement, Scenario [Axis] Document and Entity Information [Abstract] Assets, Current Entity Common Stock, Shares Outstanding Payments to Acquire Productive Assets Entity Central Index Key Earnings Per Share, Basic Deferred Tax Assets, Net, Noncurrent Liabilities, Current Operating Expenses Repayments of Debt Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Operating Activities Document Period End Date Increase (Decrease) in Accounts Payable Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Amendment Flag Net Cash Provided by (Used in) Financing Activities Document Type Assets Amendment Description Deferred Income Tax Expense (Benefit) Document Fiscal Period Focus Current Fiscal Year End Date Liabilities and Equity Operating Income (Loss) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Increase (Decrease) in Restricted Cash Earnings Per Share, Diluted Entity Voluntary Filers Interest Expense Liabilities Entity Public Float Entity Filer Category Document Fiscal Year Focus Stockholders' Equity Attributable to Parent Entity Well-known Seasoned Issuer Entity Registrant Name Increase (Decrease) in Inventories Entity Current Reporting Status Income Tax Expense (Benefit) Statement [Table] Statement [Line Items]