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Note 1 - Summary of Significant Accounting Policies - Noninterest Income (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Service Charges on Deposit and Sweep Accounts [Member] |  |  |
Noninterest revenue | $ 5,952,000 | $ 5,078,000 | $ 4,578,000
Credit and Debit Card [Member] |  |  |
Noninterest revenue | 8,216,000 | 7,516,000 | 5,973,000
Payroll Processing [Member] |  |  |
Noninterest revenue | 2,178,000 | 1,815,000 | 1,745,000
Customer Service [Member] |  |  |
Noninterest revenue | $ 852,000 | $ 857,000 | $ 757,000

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