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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Number of Operating Segments | 1 |
Net Cash Provided by (Used in) Investing Activities, Total | $ (268,636) | $ (184,264)
Time Deposit, Maturity (Year) | 7 years |
Other than Temporary Impairment Losses, Investments, Total | $ 0 |
Goodwill, Impairment Loss | $ 0 | 0
Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |
Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |
Building [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 15 years |
Building [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 40 years |
Interest-bearing Deposits and Federal Funds Sold Reclassified as Cash and Cash Equivalents [Member] |  |
Net Cash Provided by (Used in) Investing Activities, Total |  | $ (61,000)

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