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Note 17 - Common Stock (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2023 | Aug. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Nov. 30, 2022 | Aug. 31, 2022 | May 31, 2022 | Jun. 30, 2021 | Feb. 28, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2020
Common Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  | 200,000,000 | 200,000,000 |  | 200,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.03 | $ 0.03 |  | $ 0.03
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 743,553 |
Conversion of Stock, Amount Issued |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 6,365,264 |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  |  | $ 3,145,435 | $ 5,026,746 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 |  |  | $ 2 | $ 1.5 |  |
Dividends, Common Stock, Total |  |  |  |  |  |  |  |  |  | $ 14,021,226 | $ 10,871,254 |  |
Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  |  |  |  |  |  |  |  | 162,375 | 238,335 |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  |  | $ 3,150,000 | $ 5,030,000.00 |  |
Directors, Officers, and Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) |  |  |  |  |  |  |  |  |  | 60,500 | 60,000 | 49,650 |
Conversion of Series B Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  |  |  | 6,365 |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  | 453,044 |  |  |  |  |
Conversion of Stock, Amount Issued |  |  |  |  |  |  |  | $ 6,365,000 |  |  |  |  |
ATM Common Stock Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  | 82,901 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  | $ 740,000 |  |  |  |

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