Note 3 - Loans and Allowance for Loan Losses - Loans by Aging (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Loans receivable	$ 822,585,937	$ 753,408,413
Loans receivable, past due and accruing	0	0
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	102,791,228	115,799,200
Loans receivable, past due and accruing	0	0
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	76,565,222	90,028,775
Loans receivable, past due and accruing	0	0
Real Estate, Construction [Member]
Loans receivable	124,848,581	70,847,330
Loans receivable, past due and accruing	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	381,119,167	305,673,212
Loans receivable, past due and accruing	0	0
Commercial Portfolio Segment [Member]
Loans receivable	115,794,005	144,326,350
Loans receivable, past due and accruing	0	0
Consumer and Other Loans [Member]
Loans receivable	21,467,734	26,733,546
Loans receivable, past due and accruing	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	163,000	2,142,000
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	138,000	623,000
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate, Construction [Member]
Loans receivable	0	1,239,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	0	264,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	17,000	6,000
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable	8,000	10,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	27,000	1,136,000
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	27,000	1,058,000
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate, Construction [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	0	76,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	1,000
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable	0	1,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	5,129,000	10,226,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	1,083,000	1,071,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate, Construction [Member]
Loans receivable	2,052,000	4,189,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	247,000	161,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	1,747,000	4,784,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable	0	21,000
Financial Asset, Past Due [Member]
Loans receivable	5,319,000	13,504,000
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	1,248,000	2,752,000
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member] | Real Estate, Construction [Member]
Loans receivable	2,052,000	5,428,000
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	247,000	501,000
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	1,764,000	4,791,000
Financial Asset, Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable	8,000	32,000
Financial Asset, Not Past Due [Member]
Loans receivable	817,267,000	739,904,000
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	101,543,000	113,047,000
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	76,565,000	90,029,000
Financial Asset, Not Past Due [Member] | Real Estate, Construction [Member]
Loans receivable	122,797,000	65,419,000
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	380,872,000	305,172,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	114,030,000	139,535,000
Financial Asset, Not Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable	$ 21,460,000	$ 26,702,000