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Note 7 - Shareholders' Equity (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) |  |  |  |  | 335,195 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  | 30,000 |  |
Treasury Stock, Common, Shares (in shares) | 12,253,502 |  |  |  | 12,253,502 |  | 12,253,502
Treasury Stock, Value | $ 18,929,915 |  |  |  | $ 18,929,915 |  | $ 18,929,915
Common Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 778,310 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Other than Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ 1.63 |  |  |  | $ 1.63 | $ 1.38 |
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) | 111,732 | 223,463 |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) |  | 61,793 | 375,753 | 247,961 | 437,546 | 247,961 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 5,569 |  |  | 5,569 |  |

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