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Note 11 - Deposits - Deposits (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Non-interest bearing transaction, balance $ 87,598,281 $ 88,907,804
Non-interest bearing transaction, percentage of deposits 10.70% 11.90%
Interest bearing transaction, weighted average rate 0.93% 1.16%
Interest bearing transaction, balance $ 487,621,927 $ 388,515,712
Interest bearing transaction, percentage of deposits 59.30% 51.80%
Savings, weighted average rate 0.28% 0.30%
Savings, balance $ 39,203,818 $ 39,663,846
Savings, percentage of deposits 4.80% 5.30%
Weighted average rate 1.10% 1.17%
Deposits $ 821,406,532 $ 749,618,822
Percentage of deposits 100.00% 100.00%
Certificates, weighted average rate 2.10% 1.79%
Certificates, balance $ 206,982,506 $ 232,531,460
Certificates, percentage of deposits 25.20% 31.00%
Deposits not Including Time Deposits [Member]    
Weighted average rate 0.76% 0.89%
Deposits $ 614,424,026 $ 517,087,362
Percentage of deposits 74.80% 69.00%
Certificates of Deposit, 0 to 0.99% [Member]    
Certificates, weighted average rate 0.65% 0.69%
Certificates, balance $ 30,075,341 $ 46,485,328
Certificates, percentage of deposits 3.70% 6.20%
Certificates Of Deposit 1 To 1.99% [Member]    
Certificates, weighted average rate 1.65% 1.45%
Certificates, balance $ 29,828,669 $ 71,697,342
Certificates, percentage of deposits 3.60% 9.60%
Certificates Of Deposit 2 To 3.99% [Member]    
Certificates, weighted average rate 2.49% 2.46%
Certificates, balance $ 147,078,496 $ 114,348,790
Certificates, percentage of deposits 17.90% 15.20%