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Note 7 - Stockholders' Equity (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Oct. 31, 2021 | Aug. 31, 2020 | Jul. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Treasury Stock, Shares, Acquired (in shares) |  |  | 22,963 | 675 | 23,638 |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | $ 146,465
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  | $ 6.20 | $ 6.21 |  |
Nonvested Restricted Shares (in shares) |  |  |  |  | 16,785 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 4,166 |  |  |  |
Option Indexed to Issuer's Equity, Strike Price (in dollars per share) |  | $ 8.04 |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  | $ 33,495 |  |  | $ 33,494 |
Publicly Announced Repurchase Plan [Member] |  |  |  |  |  |
Stock Repurchase Program, Period in Force (Year) | 1 year |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | 1,000,000 |  |  | 1,000,000 |  |
Treasury Stock, Shares, Acquired (in shares) |  |  | 23,638 | 675 | 0 | 23,638
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | $ 146,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  | $ 6.20

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