Note 9 - Loans (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Impaired Financing Receivable, Recorded Investment	$ 86,333,000		$ 65,846,000
Percentage Of Charge Off To Contractual Balances For Impaired Loans	1.90%		10.70%
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve	$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	0
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 0
Minimum [Member]
Period Loan Is In Payment Default (Day)	60 days
Maximum [Member]
Period Loan Is In Payment Default (Day)	90 days
Nonaccrual Loans [Member]
Impaired Financing Receivable, Recorded Investment	$ 86,300,000		$ 65,800,000
Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Troubled Debt Restructuring	13,000,000.0		12,800,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve	52,000		7,000
Non-accruing Troubled Debt Restructuring [Member]
Financing Receivable, Troubled Debt Restructuring	14,200,000		8,200,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve	$ 2,600,000		$ 3,000