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Note 12 - Income Taxes (Details Textual) | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total | 21.30% | 8.60%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Open Tax Year | 2017 2018 2019 2020 |

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