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Note 3 - Investment Securities - Gross Unrealized Losses on Continuous Basis for Investment Securities (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Less than 12 months Fair value $ 43,137,981 $ 124,609,499
Less than 12 months Unrealized losses 3,707,309 2,126,119
12 months or more Fair value 97,268,040 6,630,634
12 months or more Unrealized losses 21,527,438 278,417
Total Fair value 140,406,021 131,240,133
Total Unrealized losses 25,234,747 2,404,536
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months Fair value 13,668,676 1,324,648
Less than 12 months Unrealized losses 1,057,412 35,720
12 months or more Fair value 1,537,715 715,650
12 months or more Unrealized losses 593,807 31,531
Total Fair value 15,206,391 2,040,298
Total Unrealized losses 1,651,219 67,251
SBA Pools [Member]    
Less than 12 months Fair value 0 0
Less than 12 months Unrealized losses 0 0
12 months or more Fair value 857,259 1,133,398
12 months or more Unrealized losses 15,234 22,664
Total Fair value 857,259 1,133,398
Total Unrealized losses 15,234 22,664
Corporate Debt Securities [Member]    
Less than 12 months Fair value 4,184,875 5,443,886
Less than 12 months Unrealized losses 356,746 55,541
12 months or more Fair value 4,805,021 0
12 months or more Unrealized losses 667,504 0
Total Fair value 8,989,896 5,443,886
Total Unrealized losses 1,024,250 55,541
Collateralized Mortgage-Backed Securities [Member]    
Less than 12 months Fair value 25,284,430 117,840,965
Less than 12 months Unrealized losses 2,293,151 2,034,858
12 months or more Fair value 90,068,045 4,781,586
12 months or more Unrealized losses 20,250,893 224,222
Total Fair value 115,352,475 122,622,551
Total Unrealized losses $ 22,544,044 $ 2,259,080