Note 8 - Commitments and Off-balance Sheet Risk (Details Textual) - USD ($)	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 35,153,000	$ 35,363,000	$ 38,695,000	$ 37,967,000
Retail Lines of Credit and Credit Card Receivables [Member] \| Maximum [Member]
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 100,000

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant