Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Total past due	$ 2,045	$ 3,145
Current	649,471	571,201
Loans	651,516	574,346
Non-accrual loans	1,480	1,459
Accruing loans past due 90 days or more amounted	1	97
Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	798	2,013
Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	429	571
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	818	561
Real Estate 1 [Member] \| Construction and Land Development [Member]
Total past due	110	166
Current	31,871	42,998
Loans	31,981	43,164
Non-accrual loans	400	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	0	0
Real Estate 1 [Member] \| Construction and Land Development [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	0	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	110	30
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member]
Total past due	1,046	1,849
Current	233,142	227,589
Loans	234,188	229,438
Non-accrual loans	497	630
Accruing loans past due 90 days or more amounted	0	67
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	526	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	354	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	166	115
Real Estate 1 [Member] \| Other Real Estate Loans [Member]
Total past due	675	873
Current	247,820	235,682
Loans	248,495	236,555
Non-accrual loans	583	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	134	457
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	0	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	541	416
Commercial and Industrial Loans [Member]
Total past due	155	95
Current	124,551	50,058
Loans	124,706	50,153
Non-accrual loans	0	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	96	45
Commercial and Industrial Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	59	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	59	162
Current	12,087	14,874
Loans	12,146	15,036
Non-accrual loans	0	0
Accruing loans past due 90 days or more amounted	1	0
Consumer and Other Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	42	83
Consumer and Other Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	16	79
Consumer and Other Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	$ 1	$ 0