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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Apr. 30, 2021
Stock Issued During Period, Value, New Issues | $ 139,000 | $ 106,000 | $ 272,000 | $ 281,000 |
Stock Repurchased During Period, Shares (in shares) |  |  | 25,899 |  |
Stock Repurchased During Period, Value |  | $ 2,897,000 | $ 682,000 | $ 2,897,000 |
Stock Repurchased, Price Per Share (in dollars per share) |  |  | $ 26.35 |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  | 390,114
Stock Repurchase Program, Percent of Stock Outstanding |  |  |  |  | 5.00%
Directors' Stock Purchase Plan [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 7,407 |  |
Stock Issued During Period, Value, New Issues |  |  | $ 192,000 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 4,257 |  |
Stock Issued During Period, Value, New Issues |  |  | $ 80,000 |  |

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