Document and Entity Information [Abstract] Document and Entity Information [Abstract] Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Balance Sheets Assets [Abstract] ASSETS Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Marketable Securities, Current Marketable securities, short term Marketable Securities, Current, Total Accounts Receivable, Net, Current Accounts receivable, net of allowance for uncollectible accounts of $15,000 Accounts Receivable, Net, Current, Total Inventory, Net Inventories Total inventories Prepaid Expense and Other Assets, Current Prepaid expenses and other assets Prepaid Expense and Other Assets, Current, Total Assets, Current Total current assets Property, Plant and Equipment, Net [Abstract] Fixed assets Machinery and Equipment, Gross Machinery and equipment Machinery and Equipment, Gross, Total Leasehold Improvements, Gross Leasehold improvements Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Gross fixed assets Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Net fixed assets Marketable Securities, Noncurrent Marketable securities, long term Marketable Securities, Noncurrent, Total Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Employee-related Liabilities, Current Accrued payroll and other Employee-related Liabilities, Current, Total Deferred Tax Liabilities, Current Deferred taxes Liabilities, Current Total current liabilities Stockholders' Equity Attributable to Parent [Abstract] Shareholders' equity Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock, $0.01 par value, 6,000,000 shares authorized; 4,860,436 issued and outstanding as of December 31, 2012 and 4,824,745 issued and outstanding as of March 31, 2012 Common Stock, Value, Issued, Total Common stock, $0.01 par value, 6,000,000 shares authorized; 4,776,198 issued and outstanding as of September 30 and March 31, 2011 Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Retained Earnings (Accumulated Deficit), Total Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Accounts receivable, allowance for uncollectible accounts Common Stock, Par or Stated Value Per Share Common stock par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock shares, issued Common Stock, Shares, Issued, Total Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock shares, outstanding Statements of Income Revenues [Abstract] Revenue Sales Revenue, Goods, Net Product sales Sales Revenue, Goods, Net, Total Contracts Revenue Contract research and development Revenues Total revenue Cost of Revenue Cost of sales Cost of Revenue, Total Gross Profit Gross profit Operating Expenses [Abstract] Expenses Selling, General and Administrative Expense Selling, general , and administrative Selling, General and Administrative Expense, Total Research and Development Expense Research and development Research and Development Expense, Total Operating Expenses Total expenses Operating Income (Loss) Income from operations Investment Income, Interest Interest income Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before taxes Income Tax Expense (Benefit) Provision for income taxes Income Tax Expense (Benefit), Total Net Income (Loss) Attributable to Parent Net income Net income Earnings Per Share, Basic Net income per share - basic Earnings Per Share, Basic, Total Earnings Per Share, Diluted Net income per share - diluted Earnings Per Share, Diluted, Total Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted average common shares outstanding - basic Weighted Average Number of Shares Outstanding, Diluted Diluted Shares used in computing net income per share - diluted Shares used in computing net income per share - diluted Comprehensive Income Abstract Comprehensive Income [Abstract] Marketable Securities, Unrealized Gain (Loss) Unrealized (loss) on marketable securities, net of tax Marketable Securities, Unrealized Gain (Loss), Total Unrealized loss from marketable securities, net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Comprehensive income Comprehensive income Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] OPERATING ACTIVITIES Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: provided by operating activities: Depreciation Depreciation, Total Share-based Compensation Stock-based compensation Stock-based compensation Share-based Compensation, Total Share-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefits Excess tax benefits Tax provisions Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit), Total Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) in Inventories Inventories Inventories Increase (Decrease) in Inventories, Total Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] INVESTING ACTIVITIES Payments to Acquire Property, Plant, and Equipment Purchases of fixed assets Purchases of fixed assets Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Marketable Securities Purchases of marketable securities Purchases of marketable securities Payments to Acquire Marketable Securities, Total Proceeds from Sale and Maturity of Marketable Securities Proceeds from maturities and sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities, Total Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net cash used in investing activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] FINANCING ACTIVITIES Proceeds from Issuance of Common Stock Net proceeds from sale of common stock Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefits Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Net cash provided by financing activities Cash and Cash Equivalents, Period Increase (Decrease) (Decrease) increase in cash and cash equivalents Increase in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Income Taxes Paid Cash paid during the period for income taxes Description Of Business [Abstract] Business Description and Basis of Presentation [Text Block] Description Of Business Interim Financial Information [Abstract] Quarterly Financial Information [Text Block] Interim Financial Information Recent Accounting Pronouncements [Abstract] Recent Accounting Pronouncements Disclosure [Text Block] Recent Accounting Pronouncements Disclosure [Text Block] Recent Accounting Pronouncements Net Income Per Share [Abstract] Earnings Per Share [Text Block] Net Income Per Share Marketable Securities [Abstract] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Marketable Securities Inventories [Abstract] Inventory Disclosure [Text Block] Inventories Stock-Based Compensation [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Stock Repurchase Plan Abstract Stock Repurchase Plan [Abstract] Stock Repurchase Plan Disclosure Text Block Stock Repurchase Plan Disclosure Text Block Stock Repurchase Plan Schedule of Weighted Average Number of Shares [Table Text Block] Schedule Of Weighted Average Number Of Shares Marketable Securities [Text Block] Fair Value Of Marketable Securities By Maturity Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Amortized Cost And Approximate Fair Values Of Marketable Securities Schedule of Unrealized Loss on Investments [Table Text Block] Gross Unrealized Losses And Fair Values Of Investments By Investment Category And Length Of Time Schedule Of Inventories Incremental Common Shares Attributable To Stock Options Incremental Common Shares Attributable To Stock Options Stock options Incremental Common Shares Attributable To Warrants Incremental Common Shares Attributable To Warrants Warrants Schedule of Investments [Table] Schedule of Investments [Line Items] Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total Gross unrealized losses Available-for-sale Securities, Fair Value Disclosure Available-for-sale securities, fair value Fair Market Value Marketable securities, Total, fair value Available-for-sale Securities, Debt Maturities, within One Year, Fair Value Marketable securities, debt maturities due within one year, fair value Available For Sale Securities Debt Maturities After One Through Three Years Fair Value Available For Sale Securities Debt Maturities After One Through Three Years Fair Value Marketable securities, debt maturities due after one year through three years, fair value Available For Sale Securities Debt Maturities After Three Through Five Years Fair Value Available For Sale Securities Debt Maturities After Three Through Five Years Fair Value Marketable securities, debt maturities due after three years through five years, fair value Available-for-sale Securities, Amortized Cost Basis Adjusted Cost Available-for-sale Securities, Amortized Cost Basis, Total Available-for-sale Securities, Gross Unrealized Gains Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains, Total Available-for-sale Securities, Gross Unrealized Losses Gross Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses, Total Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total Inventory, Raw Materials Raw materials Inventory, Raw Materials, Total Inventory, Work in Process Work in process Inventory, Finished Goods Finished goods Inventory, Finished Goods, Total Inventory, Gross Gross inventories Inventory, Gross, Total Inventory Adjustments Less inventory reserve Less inventory reserve Inventory Adjustments, Total Stock Repurchase Program, Remaining Authorized Repurchase Amount Authorized common stock for repurchase Investment Type [Axis] Investment Type Categorization [Member] Investment Type Categorization [Domain] Corporate Bond Securities [Member] Corporate Bonds [Member] Municipal Bonds [Member] Municipal Bonds [Member]