Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Total past due	$ 3,793	$ 3,145
Current	578,074	571,201
Loans	581,867	574,346
Non-accrual loans	1,522	1,459
Accruing loans past due 90 days or more amounted	86	97
Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	2,805	2,013
Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	278	571
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	710	561
Real Estate 1 [Member] \| Construction and Land Development [Member]
Total past due	220	166
Current	40,059	42,998
Loans	40,279	43,164
Non-accrual loans	400	367
Accruing loans past due 90 days or more amounted		30
Real Estate 1 [Member] \| Construction and Land Development [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	110
Real Estate 1 [Member] \| Construction and Land Development [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		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	1,948	1,849
Current	229,032	227,589
Loans	230,980	229,438
Non-accrual loans	667	630
Accruing loans past due 90 days or more amounted	67	67
Real Estate 1 [Member] \| Secured by Multi-family Residential Properties [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	1,614	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	164	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	170	115
Real Estate 1 [Member] \| Other Real Estate Loans [Member]
Total past due	1,363	873
Current	240,011	235,682
Loans	241,374	236,555
Non-accrual loans	455	462
Accruing loans past due 90 days or more amounted
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	952	457
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due
Real Estate 1 [Member] \| Other Real Estate Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	411	416
Commercial and Industrial Loans [Member]
Total past due	54	95
Current	55,454	50,058
Loans	55,508	50,153
Non-accrual loans
Accruing loans past due 90 days or more amounted
Commercial and Industrial Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	40	45
Commercial and Industrial Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	14	50
Commercial and Industrial Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due
Consumer and Other Loans [Member]
Total past due	208	162
Current	13,518	14,874
Loans	13,726	15,036
Non-accrual loans
Accruing loans past due 90 days or more amounted	19
Consumer and Other Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	89	83
Consumer and Other Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	100	79
Consumer and Other Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	$ 19