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Note 12 - Income Taxes (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total | 23.50% | 21.90% |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Open Tax Year |  |  | 2017 2018 2019 2020 2021

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