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Note 7 - Stockholders' Equity - Common Share Dividends (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2021 | Sep. 01, 2021 | Jun. 01, 2021 | Mar. 01, 2021 | Dec. 01, 2020 | Sep. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Dividend, per share (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.05 | $ 0.05 |  |
Total dividend paid | $ 822,120 | $ 821,628 | $ 816,604 | $ 680,247 | $ 679,779 | $ 677,869 | $ 3,140,600 | $ 1,357,648

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