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Note 1 - Significant Accounting Policies - Noninterest Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Service Charges on Deposit and Sweep Accounts [Member]
Noninterest revenue	$ 1,370,000	$ 1,579,000	$ 3,411,000	$ 4,489,000
Credit and Debit Card [Member]
Noninterest revenue	2,232,000	2,086,000	6,717,000	6,101,000
Payroll Processing [Member]
Noninterest revenue	591,000	533,000	1,908,000	1,635,000
Customer Service [Member]
Noninterest revenue	$ 205,000	$ 210,000	$ 612,000	$ 654,000

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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