Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Total past due	$ 1,582	$ 3,145
Current	628,332	571,201
Loans	629,914	574,346
Non-accrual loans	6,714	1,459
Accruing loans past due 90 days or more amounted	302	97
Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	824	2,013
Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	297	571
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	461	561
Real Estate 1 [Member] \| Construction and Land Development [Member]
Total past due	67	166
Current	27,261	42,998
Loans	27,328	43,164
Non-accrual loans	276	367
Accruing loans past due 90 days or more amounted	0	30
Real Estate 1 [Member] \| Construction and Land Development [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	47	0
Real Estate 1 [Member] \| Construction and Land Development [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	20	136
Real Estate 1 [Member] \| Construction and Land Development [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	0	30
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member]
Total past due	1,106	1,849
Current	234,708	227,589
Loans	235,814	229,438
Non-accrual loans	449	630
Accruing loans past due 90 days or more amounted	298	67
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	657	1,428
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	125	306
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	324	115
Real Estate 1 [Member] \| Other Real Estate Loans [Member]
Total past due	264	873
Current	246,619	235,682
Loans	246,883	236,555
Non-accrual loans	4,441	462
Accruing loans past due 90 days or more amounted	0	0
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	0	457
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	131	0
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	133	416
Commercial and Industrial Loans [Member]
Total past due	104	95
Current	109,734	50,058
Loans	109,838	50,153
Non-accrual loans	1,548	0
Accruing loans past due 90 days or more amounted	0	0
Commercial and Industrial Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	104	45
Commercial and Industrial Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	0	50
Commercial and Industrial Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	0	0
Consumer and Other Loans [Member]
Total past due	41	162
Current	10,010	14,874
Loans	10,051	15,036
Non-accrual loans	0	0
Accruing loans past due 90 days or more amounted	4	0
Consumer and Other Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	16	83
Consumer and Other Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	21	79
Consumer and Other Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	$ 4	$ 0