Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Loans	$ 836,423	$ 825,118	$ 638,202
Non-accrual loans	2,130	2,304
Accruing loans past due 90 days or more amounted	53	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	968	3,009
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	1,095	226
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	253	372
Financial Asset, Past Due [Member]
Loans	2,316	3,607
Financial Asset, Not Past Due [Member]
Loans	834,107	821,511
Real Estate 1 [Member] | Construction and Land Development [Member]
Loans	49,308	55,721	25,720
Non-accrual loans	0	0
Accruing loans past due 90 days or more amounted	53	0
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	44	0
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	115
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	53	0
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, Past Due [Member]
Loans	97	115
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, Not Past Due [Member]
Loans	49,211	55,606
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Loans	290,408	291,990	236,870
Non-accrual loans	618	766
Accruing loans past due 90 days or more amounted	0	0
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	799	1,293
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	5	100
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	200	372
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, Past Due [Member]
Loans	1,004	1,765
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, Not Past Due [Member]
Loans	289,404	290,225
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Loans	384,191	364,921	248,864
Non-accrual loans	28	29
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]
Loans	0	186
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	1,012	0
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Financial Asset, Past Due [Member]
Loans	1,012	186
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]
Loans	383,179	364,735
Commercial and Industrial Loans [Member]
Loans	103,682	99,805	117,545
Non-accrual loans	1,484	1,509
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]
Loans	102	1,474
Commercial and Industrial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	62	0
Commercial and Industrial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Commercial and Industrial Loans [Member] | Financial Asset, Past Due [Member]
Loans	164	1,474
Commercial and Industrial Loans [Member] | Financial Asset, Not Past Due [Member]
Loans	103,518	98,331
Consumer and Other Loans [Member]
Loans	8,834	12,681	$ 9,203
Non-accrual loans	0	0
Accruing loans past due 90 days or more amounted	0	0
Consumer and Other Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	23	56
Consumer and Other Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	16	11
Consumer and Other Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Consumer and Other Loans [Member] | Financial Asset, Past Due [Member]
Loans	39	67
Consumer and Other Loans [Member] | Financial Asset, Not Past Due [Member]
Loans	$ 8,795	$ 12,614