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Note 2 - Securities Available for Sale - Schedule of Debt Securities Available for Sale (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Amortized cost $ 142,357,817 $ 145,878,693
Gross unrealized gains 694,268 543,015
Gross unrealized losses (5,319,564) (6,114,261)
Fair value 137,732,521 140,307,447
US Government Agencies Debt Securities [Member]    
Amortized cost, one through five years 3,000,000 3,000,000
Gross unrealized gains, one through five years 0 0
Gross unrealized losses, one through five years (114,762) (151,590)
Fair value, one through five years 2,885,238 2,848,410
Corporate Debt Securities [Member]    
Amortized cost, one through five years 10,112,901 9,112,269
Gross unrealized gains, one through five years 89,590 83,414
Gross unrealized losses, one through five years (94,745) (64,547)
Fair value, one through five years 10,107,746 9,131,136
Amortized cost, less than one year 350,000 10,000,000
Gross unrealized gains, less than one year 930 0
Gross unrealized losses, less than one year 0 (55,870)
Fair value, less than one year 350,930 9,944,130
Amortized cost, five through ten years 23,950,000 25,410,219
Gross unrealized gains, five through ten years 177,790 202,205
Gross unrealized losses, five through ten years (1,050,658) (1,389,376)
Fair value, five through ten years 23,077,132 24,223,048
Amortized cost, greater than ten years 6,333,526 4,321,924
Gross unrealized gains, greater than ten years 194,444 202,576
Gross unrealized losses, greater than ten years 0 0
Fair value, greater than ten years 6,527,970 4,524,500
US Treasury Bill Securities [Member]    
Amortized cost, less than one year   350,000
Gross unrealized gains, less than one year   1,090
Gross unrealized losses, less than one year   0
Fair value, less than one year   351,090
US States and Political Subdivisions Debt Securities [Member]    
Amortized cost, five through ten years 506,449  
Gross unrealized gains, five through ten years 0  
Gross unrealized losses, five through ten years (91,224)  
Fair value, five through ten years 415,225  
Amortized cost, greater than ten years   506,706
Gross unrealized gains, greater than ten years   0
Gross unrealized losses, greater than ten years   (108,431)
Fair value, greater than ten years   398,275
Residential Mortgage-Backed Securities [Member]    
Amortized cost 81,687,087 76,661,752
Gross unrealized gains 231,514 53,730
Gross unrealized losses (1,944,998) (2,162,673)
Fair value 79,973,603 74,552,809
Commercial Mortgage-Backed Securities [Member]    
Amortized cost 16,417,854 16,515,823
Gross unrealized gains 0 0
Gross unrealized losses (2,023,177) (2,181,774)
Fair value $ 14,394,677 $ 14,334,049