Note 8 - Disclosures about Fair Value of Assets and Liabilities (Details) - Fair Value of Financial Instruments - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 17,621,871	$ 18,774,419	$ 44,056,887	$ 12,493,890
Held-to-maturity securities	38,781	43,099
Federal Home Loan Bank stock	2,867,000	2,837,500
Mortgage loans held for sale	1,517,016	1,902,933
Loans, net	490,064,640	491,001,907
Financial liabilities:
Deposits	519,063,768	517,385,695
Subordinated debentures	15,465,000	15,465,000
Interest payable	190,573	196,102
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	17,621,871	18,774,419
Cash and cash equivalents	17,621,871	18,774,419
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Held-to-maturity securities	38,781	43,099
Held-to-maturity securities	39,553	43,935
Federal Home Loan Bank stock	2,867,000	2,837,500
Federal Home Loan Bank stock	2,867,000	2,837,500
Mortgage loans held for sale	1,517,016	1,902,933
Mortgage loans held for sale	1,517,016	1,902,933
Interest receivable	1,769,927	1,986,692
Financial liabilities:
Deposits	519,063,768	517,385,695
Deposits	506,125,859	511,225,380
Federal Home Loan Bank advances	52,100,000	52,100,000
Federal Home Loan Bank advances	53,440,089	53,227,960
Interest payable	190,573	196,102
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	490,064,640	491,001,907
Loans, net	490,230,468	495,207,798
Financial liabilities:
Subordinated debentures	15,465,000	15,465,000
Subordinated debentures	$ 15,465,000	$ 15,465,000