Note 4 - Securities (Details Textual) - USD ($) $ in Thousands |
Mar. 31, 2023 |
Mar. 31, 2022 |
|---|---|---|
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Current | $ 0 | $ 0 |
| Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | |
| US Treasury Securities and Residential Mortgage-Backed Securities [Member] | ||
| Debt Securities, Held-to-Maturity, Allowance for Credit Loss | 0 | 0 |
| US States and Political Subdivisions Debt Securities [Member] | ||
| Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0 |
| Asset Not Pledged as Collateral and Asset Pledged as Collateral without Right [Member] | ||
| Debt Securities | $ 834,900 | $ 789,300 |
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
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