Note 7 - Deposits - Deposits (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Demand, weighted average rate	0.01%	0.00%
Demand, balance	$ 80,910,910	$ 67,897,263
Demand, percentage of deposits	16.00%	13.10%
NOW, weighted average rate	0.30%	0.31%
NOW, balance	$ 129,137,807	$ 137,472,955
NOW, percentage of deposits	25.60%	26.60%
Money market, weighted average rate	0.45%	0.42%
Money market, balance	$ 155,529,796	$ 170,602,458
Money market, percentage of deposits	30.80%	33.00%
Savings, weighted average rate	0.20%	0.20%
Savings, balance	$ 28,095,248	$ 25,864,718
Savings, percentage of deposits	5.50%	5.00%
Weighted average rate	0.43%	0.43%
Deposits	$ 505,362,750	$ 517,385,695
Percentage of deposits	100.00%	100.00%
Certificates, weighted average rate	0.90%	0.91%
Certificates, balance	$ 111,688,989	$ 115,548,301
Certificates, percentage of deposits	22.10%	22.30%
Deposits not Including Time Deposits [Member]
Weighted average rate	0.29%	0.30%
Deposits	$ 393,673,761	$ 401,837,394
Percentage of deposits	77.90%	77.70%
Certificates Of Deposit 0 to 1.99% [Member]
Certificates, weighted average rate	0.54%	0.54%
Certificates, balance	$ 57,349,324	$ 61,061,577
Certificates, percentage of deposits	11.30%	11.70%
Certificates Of Deposit 1 To 1.99% [Member]
Certificates, weighted average rate	1.28%	1.31%
Certificates, balance	$ 54,319,296	$ 53,142,739
Certificates, percentage of deposits	10.80%	10.20%
Certificates Of Deposit 2 To 3.99% [Member]
Certificates, weighted average rate	2.14%	2.17%
Certificates, balance	$ 20,369	$ 1,343,985
Certificates, percentage of deposits	0.00%	0.30%