Note 4 - Loan Receivables and Allowance for Loan and Lease Losses - Delinquency Status of Performing and Non-performing Loans (Details) - Business Activities Loans [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans receivable, gross	$ 730,180	$ 812,164
Non-accruing loans	20,005	18,049
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	282,378	314,414
Non-accruing loans	14,534	11,961
Residential Portfolio Segment [Member]
Loans receivable, gross	153,851	175,489
Non-accruing loans	3,854	3,228
Commercial Portfolio Segment [Member]
Loans receivable, gross	144,297	173,875
Non-accruing loans	700	2,094
Consumer Portfolio Segment [Member]
Loans receivable, gross	67,635	85,934
Non-accruing loans	917	766
Construction Portfolio Segment [Member]
Loans receivable, gross	66,984	48,388
Non-accruing loans
Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	15,035	14,064
Non-accruing loans
Pass [Member]
Loans receivable, gross	627,917	777,551
Non-accruing loans
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	230,824	295,982
Non-accruing loans
Pass [Member] | Residential Portfolio Segment [Member]
Loans receivable, gross	146,137	170,561
Non-accruing loans
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable, gross	102,340	163,388
Non-accruing loans
Pass [Member] | Consumer Portfolio Segment [Member]
Loans receivable, gross	66,597	85,168
Non-accruing loans
Pass [Member] | Construction Portfolio Segment [Member]
Loans receivable, gross	66,984	48,388
Non-accruing loans
Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	15,035	14,064
Non-accruing loans
Special Mention [Member]
Loans receivable, gross	42,399	836
Non-accruing loans
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross		385
Non-accruing loans
Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable, gross	25,658	451
Non-accruing loans
Special Mention [Member] | Residential Portfolio Segment [Member]
Loans receivable, gross	3,860
Non-accruing loans
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans receivable, gross	12,881
Non-accruing loans
Substandard [Member]
Loans receivable, gross	59,864
Non-accruing loans	20,005
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	25,896	18,047
Non-accruing loans	14,534	11,961
Substandard [Member] | Residential Portfolio Segment [Member]
Loans receivable, gross	3,854	4,928
Non-accruing loans	3,854	3,228
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans receivable, gross	29,076	10,036
Non-accruing loans	700	2,094
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans receivable, gross	1,038	766
Non-accruing loans	917	766
Substandard [Member] | Construction Portfolio Segment [Member]
Loans receivable, gross		33,777
Non-accruing loans		18,049
Performing Financial Instruments [Member]
Performing (accruing) loans, past due	8,486	4,441
Performing (accruing) loans, current	701,689	789,674
Loans receivable, gross	710,175	794,115
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	363
Performing (accruing) loans, current	267,481	302,453
Loans receivable, gross	267,844	302,453
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	839	658
Performing (accruing) loans, current	149,158	171,603
Loans receivable, gross	149,997	172,261
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	4,925	956
Performing (accruing) loans, current	138,672	170,825
Loans receivable, gross	143,597	171,781
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	8	2,827
Performing (accruing) loans, current	66,710	82,341
Loans receivable, gross	66,718	85,168
Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due	2,351
Performing (accruing) loans, current	64,633	48,388
Loans receivable, gross	66,984	48,388
Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	15,035	14,064
Loans receivable, gross	15,035	14,064
Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	3,407	4,162
Performing (accruing) loans, current	624,510	773,389
Loans receivable, gross	627,917	777,551
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	230,824	295,982
Loans receivable, gross	230,824	295,982
Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	839	658
Performing (accruing) loans, current	145,298	169,903
Loans receivable, gross	146,137	170,561
Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	209	677
Performing (accruing) loans, current	102,131	162,711
Loans receivable, gross	102,340	163,388
Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	8	2,827
Performing (accruing) loans, current	66,589	82,341
Loans receivable, gross	66,597	85,168
Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due	2,351
Performing (accruing) loans, current	64,633	48,388
Loans receivable, gross	66,984	48,388
Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	15,035	14,064
Loans receivable, gross	15,035	14,064
Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due	4,000	279
Performing (accruing) loans, current	38,399	557
Loans receivable, gross	42,399	836
Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current		385
Loans receivable, gross		385
Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due		279
Performing (accruing) loans, current	25,658	172
Loans receivable, gross	25,658	451
Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	3,860
Loans receivable, gross	3,860
Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	4,000
Performing (accruing) loans, current	8,881
Loans receivable, gross	12,881
Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due	1,079
Performing (accruing) loans, current	38,780
Loans receivable, gross	39,859
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	363
Performing (accruing) loans, current	10,999	6,086
Loans receivable, gross	11,362	6,086
Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current		1,700
Loans receivable, gross		1,700
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	716
Performing (accruing) loans, current	27,660	7,942
Loans receivable, gross	28,376	7,942
Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	121
Loans receivable, gross	121
Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current		15,728
Loans receivable, gross		15,728
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member]
Performing (accruing) loans, past due	1,436	4,069
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	354
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	478	658
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	603	606
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	1	2,805
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	479	3,790
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	478	658
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due		327
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	1	2,805
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due		279
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due		279
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due	957
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	354
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	603
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member]
Performing (accruing) loans, past due	7,034	353
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	361
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	4,322	350
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due		3
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due	2,351
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	2,921	353
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	361
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	209	350
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due		3
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due	2,351
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due	4,000
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	4,000
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due	113
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	113
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member]
Performing (accruing) loans, past due	16	19
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	7	19
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	7	19
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	7	19
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due