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Note 4 - Allowance for Loan Losses (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2020 | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring | $ 6,000 |  | $ 1,700 |
Financing Receivable, Modifications, Number of Contracts |  | 0 | 0 |
Financing Receivable, Deferred Payments |  |  | $ 0 |
Financing Receivable, Modifications, Interest Only Payments |  |  | 14,600 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  |  | 0 | $ 0
Minimum [Member] |  |  |  |
Financing Receivable, Modifications, Interest Only Payments, Period (Month) | 6 months |  |  |
Maximum [Member] |  |  |  |
Financing Receivable, Modifications, Interest Only Payments, Period (Month) | 24 months |  |  |
Performing Financial Instruments [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring | $ 0 |  | $ 0 |

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