Note 3 - Loans and Allowance for Loan Losses - Loans by Credit Quality (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Loans receivable	$ 822,585,937	$ 753,408,413
Real Estate, Construction [Member]
Loans receivable	124,848,581	70,847,330
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	381,119,167	305,673,212
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	102,791,228	115,799,200
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	76,565,222	90,028,775
Commercial Portfolio Segment [Member]
Loans receivable	115,794,005	144,326,350
Consumer and Other Loans [Member]
Loans receivable	21,467,734	26,733,546
Pass [Member]
Loans receivable	769,617,000	685,352,000
Pass [Member] | Real Estate, Construction [Member]
Loans receivable	121,892,000	64,531,000
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	342,560,000	262,771,000
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	100,830,000	110,615,000
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	75,166,000	90,029,000
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable	107,872,000	130,874,000
Pass [Member] | Consumer and Other Loans [Member]
Loans receivable	21,297,000	26,532,000
Special Mention [Member]
Loans receivable	31,143,000	4,565,000
Special Mention [Member] | Real Estate, Construction [Member]
Loans receivable	0	0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	24,589,000	4,442,000
Special Mention [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	68,000	0
Special Mention [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	1,399,000	0
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans receivable	5,087,000	123,000
Special Mention [Member] | Consumer and Other Loans [Member]
Loans receivable	0	0
Substandard [Member]
Loans receivable	21,826,000	63,491,000
Substandard [Member] | Real Estate, Construction [Member]
Loans receivable	2,957,000	6,316,000
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	13,970,000	38,460,000
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	1,893,000	5,184,000
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	0	0
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans receivable	2,835,000	13,329,000
Substandard [Member] | Consumer and Other Loans [Member]
Loans receivable	171,000	202,000
Doubtful [Member]
Loans receivable	0	0
Doubtful [Member] | Real Estate, Construction [Member]
Loans receivable	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable	0	0
Doubtful [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable	0	0
Doubtful [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	0
Doubtful [Member] | Consumer and Other Loans [Member]
Loans receivable	$ 0	$ 0