Note 4 - Loans - Accruing Troubled Debt Restructurings (Details) - Accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accruing TDRs	$ 12,837	$ 27,721
Payment Deferral [Member]
Accruing TDRs	5,270	6,222
Contractual Interest Rate Reduction [Member]
Accruing TDRs	5,771	5,910
Rate Reduction and Payment Deferral [Member]
Accruing TDRs	1,796	15,589
Commercial Portfolio Segment [Member]
Accruing TDRs	3,368	3,983
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Accruing TDRs	3,368	3,983
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Accruing TDRs	0	0
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Accruing TDRs	0	0
Commercial Real Estate Portfolio Segment [Member]
Accruing TDRs	6,128	19,575
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Accruing TDRs	438	515
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Accruing TDRs	5,522	5,635
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Accruing TDRs	168	13,425
Residential Portfolio Segment [Member]
Accruing TDRs	3,341	4,163
Residential Portfolio Segment [Member] | Payment Deferral [Member]
Accruing TDRs	1,464	1,724
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Accruing TDRs	249	275
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Accruing TDRs	$ 1,628	$ 2,164