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Note 11 - Deposits - Deposits (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Non-interest bearing transaction, balance $ 144,911,156 $ 87,598,281
Non-interest bearing transaction, percentage of deposits 15.40% 10.70%
Interest bearing transaction, weighted average rate 0.35% 0.93%
Interest bearing transaction, balance $ 560,970,668 $ 487,621,927
Interest bearing transaction, percentage of deposits 59.80% 59.30%
Savings, weighted average rate 0.13% 0.28%
Savings, balance $ 47,839,075 $ 39,203,818
Savings, percentage of deposits 5.10% 4.80%
Weighted average rate 0.58% 1.10%
Balance $ 938,672,541 $ 821,406,532
Percentage of deposits 100.00% 100.00%
Certificates, weighted average rate 1.86% 2.10%
Certificates, balance $ 184,951,642 $ 206,982,506
Certificates, percentage of deposits 19.70% 25.20%
Deposits not Including Time Deposits [Member]    
Weighted average rate 0.27% 0.76%
Balance $ 753,720,899 $ 614,424,026
Percentage of deposits 80.30% 74.80%
Certificates of Deposit, 0 to 0.99% [Member]    
Certificates, weighted average rate 0.62% 0.65%
Certificates, balance $ 49,395,262 $ 30,075,341
Certificates, percentage of deposits 5.20% 3.70%
Certificates Of Deposit 1 To 1.99% [Member]    
Certificates, weighted average rate 1.47% 1.65%
Certificates, balance $ 13,875,409 $ 29,828,669
Certificates, percentage of deposits 1.50% 3.60%
Certificates Of Deposit 2 To 3.99% [Member]    
Certificates, weighted average rate 2.41% 2.49%
Certificates, balance $ 121,680,971 $ 147,078,496
Certificates, percentage of deposits 13.00% 17.90%