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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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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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