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Note 9 - Deposits - Deposits (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Non-interest bearing transaction, balance $ 259,389,511 $ 144,911,156
Non-interest bearing transaction, percentage of deposits 25.50% 15.40%
Interest bearing transaction, weighted average rate 0.29% 0.35%
Interest bearing transaction, balance $ 540,204,521 $ 560,970,668
Interest bearing transaction, percentage of deposits 53.20% 59.80%
Savings, weighted average rate 0.13% 0.13%
Savings, balance $ 71,873,348 $ 47,839,075
Savings, percentage of deposits 7.10% 5.10%
Weighted average rate 0.28% 0.58%
Balance $ 1,016,318,755 $ 938,672,541
Percentage of deposits 100.00% 100.00%
Certificates, weighted average rate 0.83% 1.86%
Certificates, balance $ 144,851,375 $ 184,951,642
Certificates, percentage of deposits 14.20% 19.70%
Deposits not Including Time Deposits [Member]    
Weighted average rate 0.19% 0.27%
Balance $ 871,467,380 $ 753,720,899
Percentage of deposits 85.80% 80.30%
Certificates of Deposit, 0 to 0.99% [Member]    
Certificates, weighted average rate 0.36% 0.62%
Certificates, balance $ 106,101,344 $ 49,395,262
Certificates, percentage of deposits 10.40% 5.20%
Certificates Of Deposit 1 To 1.99% [Member]    
Certificates, weighted average rate 1.47% 1.47%
Certificates, balance $ 9,575,861 $ 13,875,409
Certificates, percentage of deposits 0.90% 1.50%
Certificates Of Deposit 2 To 3.99% [Member]    
Certificates, weighted average rate 2.31% 2.41%
Certificates, balance $ 29,174,170 $ 121,680,971
Certificates, percentage of deposits 2.90% 13.00%