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Note 3 - Loans - Summary of Loan Classes and an Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Total past due	$ 5,621	$ 1,582
Current	632,581	628,332
Loans	638,202	629,914	$ 581,867
Non-accrual loans	6,814	6,714
Accruing loans past due 90 days or more amounted		302
Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	1,041	824
Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	153	297
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	4,427	461
Real Estate 1 [Member] | Construction and Land Development [Member]
Total past due	46	67
Current	25,674	27,261
Loans	25,720	27,328	40,279
Non-accrual loans	269	276
Accruing loans past due 90 days or more amounted
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	46	47
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		20
Real Estate 1 [Member] | Construction and Land Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Total past due	929	1,106
Current	235,941	234,708
Loans	236,870	235,814	230,980
Non-accrual loans	430	449
Accruing loans past due 90 days or more amounted		298
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	905	657
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due		125
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	24	324
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Total past due	4,532	264
Current	244,332	246,619
Loans	248,864	246,883	241,374
Non-accrual loans	4,567	4,441
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
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	129	131
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due	4,403	133
Commercial and Industrial Loans [Member]
Total past due	59	104
Current	117,486	109,734
Loans	117,545	109,838	55,508
Non-accrual loans	1,548	1,548
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	59	104
Commercial and Industrial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due
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	55	41
Current	9,148	10,010
Loans	9,203	10,051	$ 13,726
Non-accrual loans
Accruing loans past due 90 days or more amounted		4
Consumer and Other Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total past due	31	16
Consumer and Other Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total past due	24	21
Consumer and Other Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total past due		$ 4

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Amount of financing receivable 90 days or more past due and still accruing.

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