Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loans receivable, gross	$ 714,538		$ 730,180
Business Activities Loans [Member]
Loans receivable, gross	714,538	$ 714,538	730,180
Non-accruing loans	28,046	28,046	20,005
Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		686,492	710,175
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	315,853		282,378
Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	315,853	315,853	282,378
Non-accruing loans		19,223	14,534
Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		296,630	267,844
Residential Portfolio Segment [Member]
Loans receivable, gross	171,800		153,851
Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	171,800	171,800	153,851
Non-accruing loans		4,473	3,854
Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		167,327	149,997
Commercial Portfolio Segment [Member]
Loans receivable, gross	119,688		144,297
Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	119,688	119,688	144,297
Non-accruing loans	4,204	4,204	700
Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		115,484	143,597
Consumer Portfolio Segment [Member]
Loans receivable, gross	53,676		67,635
Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	53,676	53,676	67,635
Non-accruing loans		146	917
Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		53,530	66,718
Substandard [Member] \| Business Activities Loans [Member]
Loans receivable, gross		41,522	59,864
Non-accruing loans		28,046	20,005
Substandard [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		13,476	39,859
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross		30,497	25,896
Non-accruing loans	19,223	19,223	14,534
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		11,274	11,362
Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross		4,473	3,854
Non-accruing loans	4,473	4,473	3,854
Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross		6,383	29,076
Non-accruing loans		4,204	700
Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		2,179	28,376
Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross		169	1,038
Non-accruing loans	146	146	917
Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		23	121
Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Non-accruing loans			700
Financial Asset, 30 to 59 Days Past Due [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		2,657	1,436
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		428	354
Financial Asset, 30 to 59 Days Past Due [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		50	478
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		1,557	603
Financial Asset, 30 to 59 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		18	1
Financial Asset, 30 to 59 Days Past Due [Member] \| Non-Accrual Loans [Member] \| Business Activities Loans [Member]
Loans receivable, gross	497		22
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		657	957
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	354
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		657	603
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	0		0
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	0		0
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	497
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross			0
Financial Asset, 30 to 59 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	0		22
Financial Asset, 60 to 89 Days Past Due [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		1,272	7,034
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	361
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		1,270	4,322
Financial Asset, 60 to 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		2	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Non-Accrual Loans [Member] \| Business Activities Loans [Member]
Loans receivable, gross	9,046		0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		688	113
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		688	113
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	8,950		0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	0		0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	0		0
Financial Asset, 60 to 89 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	96		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	16
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	7
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Non-Accrual Loans [Member] \| Business Activities Loans [Member]
Loans receivable, gross	11,658		9,398
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	6,831		5,723
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	2,320		2,884
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	2,478		700
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	29		91
Financial Asset, Past Due [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		3,929	8,486
Financial Asset, Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		428	363
Financial Asset, Past Due [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		50	839
Financial Asset, Past Due [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		2,827	4,925
Financial Asset, Past Due [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		20	8
Financial Asset, Past Due [Member] \| Non-Accrual Loans [Member] \| Business Activities Loans [Member]
Loans receivable, gross	21,201		9,420
Financial Asset, Past Due [Member] \| Substandard [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		1,345	1,079
Financial Asset, Past Due [Member] \| Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	363
Financial Asset, Past Due [Member] \| Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Past Due [Member] \| Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		1,345	716
Financial Asset, Past Due [Member] \| Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	15,781		5,723
Financial Asset, Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	2,320		2,884
Financial Asset, Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	2,975		700
Financial Asset, Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	125		113
Financial Asset, Not Past Due [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		682,563	701,689
Financial Asset, Not Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		296,202	267,481
Financial Asset, Not Past Due [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		167,277	149,158
Financial Asset, Not Past Due [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		112,657	138,672
Financial Asset, Not Past Due [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		53,510	66,710
Financial Asset, Not Past Due [Member] \| Non-Accrual Loans [Member] \| Business Activities Loans [Member]
Loans receivable, gross	6,845		10,585
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		12,131	38,780
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		11,274	10,999
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		0	0
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		834	27,660
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member] \| Performing Financial Instruments [Member]
Loans receivable, gross		$ 23	121
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	3,442		8,811
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Residential Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	2,153		970
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Commercial Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	1,229		0
Financial Asset, Not Past Due [Member] \| Substandard [Member] \| Non-Accrual Loans [Member] \| Consumer Portfolio Segment [Member] \| Business Activities Loans [Member]
Loans receivable, gross	$ 21		$ 804

Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Non-accrual Loans (Details) - USD ($)
$ in Thousands

Sep. 30, 2021

Jun. 30, 2021

Dec. 31, 2020

Loans receivable, gross

$ 714,538

$ 730,180

Business Activities Loans [Member]

Loans receivable, gross

714,538

$ 714,538

730,180