Note 4 - Loans Receivables and Allowance for Loan and Lease Losses - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Impaired loans, recorded investment	$ 19,900		$ 19,900
With no allowance recorded, average recorded investment	10,980	$ 15,606	10,808	$ 15,503
With no allowance recorded, interest income recognized	27	118	123	197
With allowance recorded, average recorded investment	11,321	13,140	12,445	11,224
With allowance recorded, interest income recognized	14	63	135	132
Impaired Loans, Average recorded investment	22,301	28,746	23,253	26,727
Impaired Loans, interest income recognized	41	181	258	329
Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	6,333		6,333		$ 10,820
Impaired loans with no related allowance recorded, unpaid principal balance	6,251		6,251		11,820
Impaired loans with a related allowance recorded, recorded investment	13,546		13,546		12,982
Impaired loans with a related allowance recorded, unpaid principal balance	13,557		13,557		13,416
Impaired loans, related allowance	6,063		6,063		2,299
Impaired loans, recorded investment	19,879		19,879		23,802
Impaired loans, unpaid principal balance	19,808		19,808		25,236
Commercial Real Estate Portfolio Segment [Member]
With no allowance recorded, average recorded investment	6,704	8,671	6,716	7,538
With no allowance recorded, interest income recognized	13	95	31	133
With allowance recorded, average recorded investment	7,096	8,916	8,156	8,854
With allowance recorded, interest income recognized	7	0	72	0
Impaired Loans, Average recorded investment	13,800	17,587	14,872	16,392
Impaired Loans, interest income recognized	20	95	103	133
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	2,780		2,780		6,820
Impaired loans with no related allowance recorded, unpaid principal balance	2,599		2,599		7,776
Impaired loans with a related allowance recorded, recorded investment	8,819		8,819		8,884
Impaired loans with a related allowance recorded, unpaid principal balance	8,670		8,670		8,811
Impaired loans, related allowance	5,072		5,072		1,567
Impaired loans, recorded investment	11,599		11,599		15,704
Impaired loans, unpaid principal balance	11,269		11,269		16,587
Residential Portfolio Segment [Member]
With no allowance recorded, average recorded investment	1,580	3,752	2,332	4,088
With no allowance recorded, interest income recognized	8	15	72	45
With allowance recorded, average recorded investment	1,525	824	885	427
With allowance recorded, interest income recognized	6	7	10	14
Impaired Loans, Average recorded investment	3,105	4,576	3,217	4,515
Impaired Loans, interest income recognized	14	22	82	59
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	2,451		2,451		2,847
Impaired loans with no related allowance recorded, unpaid principal balance	2,444		2,444		2,763
Impaired loans with a related allowance recorded, recorded investment	438		438		461
Impaired loans with a related allowance recorded, unpaid principal balance	435		435		488
Impaired loans, related allowance	6		6		8
Impaired loans, recorded investment	2,889		2,889		3,308
Impaired loans, unpaid principal balance	2,879		2,879		3,251
Commercial Portfolio Segment [Member]
With no allowance recorded, average recorded investment	2,354	2,657	1,311	3,122
With no allowance recorded, interest income recognized	0	4	5	9
With allowance recorded, average recorded investment	2,358	3,231	3,167	1,856
With allowance recorded, interest income recognized	0	55	50	113
Impaired Loans, Average recorded investment	4,712	5,888	4,478	4,978
Impaired Loans, interest income recognized	0	59	55	122
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	585		585		630
Impaired loans with no related allowance recorded, unpaid principal balance	692		692		758
Impaired loans with a related allowance recorded, recorded investment	4,122		4,122		3,471
Impaired loans with a related allowance recorded, unpaid principal balance	4,276		4,276		3,916
Impaired loans, related allowance	984		984		723
Impaired loans, recorded investment	4,707		4,707		4,101
Impaired loans, unpaid principal balance	4,968		4,968		4,674
Consumer Portfolio Segment [Member]
With no allowance recorded, average recorded investment	342	526	449	755
With no allowance recorded, interest income recognized	6	4	15	10
With allowance recorded, average recorded investment	342	169	237	87
With allowance recorded, interest income recognized	1	1	3	5
Impaired Loans, Average recorded investment	684	695	686	842
Impaired Loans, interest income recognized	7	$ 5	18	$ 15
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	517		517		523
Impaired loans with no related allowance recorded, unpaid principal balance	516		516		523
Impaired loans with a related allowance recorded, recorded investment	167		167		166
Impaired loans with a related allowance recorded, unpaid principal balance	176		176		201
Impaired loans, related allowance	1		1		1
Impaired loans, recorded investment	684		684		689
Impaired loans, unpaid principal balance	$ 692		$ 692		$ 724