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Note 6 - Shareholders' Equity (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 13, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  | 585,000 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  | $ 1.68 | $ 1.88 |
Treasury Stock, Common, Shares (in shares) |  | 12,253,502 |  |  |  | 12,253,502 |  | 12,253,502
Treasury Stock, Value, Ending Balance |  | $ 18,929,915 |  |  |  | $ 18,929,915 |  | $ 18,929,915
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 |  |  |  | $ 0.001 |  | $ 0.001
Open Market Sale Agreement [Member] |  |  |  |  |  |  |  |
Sale of Stock, Authorized Offering Amount | $ 50,000,000.0 |  |  |  |  |  |  |
Sale of Stock, Percentage of Commissions Paid of Gross Proceeds From Sale Of Each Share | 3.00% |  |  |  |  |  |  |
Sale of Stock, Reimbursable Legal Expenses | $ 50,000 |  |  |  |  |  |  |
Sale of Stock, Termination Amount Under Agreement | $ 50,000,000.0 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 525,000 | 60,000 | 23,000 | 100,000 | 585,000 | 123,000 |

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