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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended | 216 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Cost Method Investments | $ 1,921,000 | $ 3,081,000 | $ 1,921,000
Share-based Payment Arrangement, Expense | $ 386,000 | $ 191,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 42,000 | 1,356,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 16.15 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 235,000 |  | $ 235,000
The 2020 Non-employee Director Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) | 4,380 |  |
The 2011 Non-employee Director Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 12,000 |
General and Administrative Expense [Member] |  |  |
Depreciation, Total | $ 2,138,000 | $ 1,012,000 |

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