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Note 1 - Organization and Summary of Significant Accounting Policies (Detail) (USD $) | 12 Months Ended | 253 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012
Number of Operating Segments | 2 |  |
Available-for-sale Securities, Amortized Cost Basis (in Dollars) | $ 264,000 |  | $ 264,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (in Dollars) | 6,000 |  | 6,000
Inventory Valuation Reserves (in Dollars) | 78,000 | 76,000 | 78,000
Depreciation (in Dollars) | 476,000 | 391,000 |
Operating Leases, Income Statement, Lease Revenue (in Dollars) | 2,231,000 | 2,067,000 |
Operating Leases, Future Minimum Payments Receivable (in Dollars) | 120,000 | 402,000 | 120,000
Cost-method Investments, Other than Temporary Impairment (in Dollars) | 17,000 |  |
Number of Investments, Cost Method, Impaired During the Period | 1 |  |
Equity Method Investments (in Dollars) | 892,000 | 905,000 | 892,000
Cost Method Investments (in Dollars) | 667,000 | 383,000 | 667,000
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Fair Value Hierarchy, Number of Levels | 3 |  | 3
Software Arrangements, Number of Categories | 4 |  | 4
Deferred Revenue, Current, Term | 12 months |  | 12 months
Product Warranty Accrual (in Dollars) | 164,000 | 136,000 | 164,000
Allocated Share-based Compensation Expense (in Dollars) | 79,000 | 43,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 17,000 | 164,500 | 1,198,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ 1.28 | $ 1.25 |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options (in Dollars) | $ 113,000 |  | $ 113,000
Notes Receivable [Member] |  |  |
Fair Value Inputs, Discount Rate | 4.00% |  |
2011 Non-Employee Directors Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 17,000 | 12,000 |
2003 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 152,500 |  |
Minimum [Member] |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  | 20.00%
Maximum [Member] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00%

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