Note 11 - Disclosures about Fair Value of Assets and Liabilities (Details) - Fair Value of Financial Instruments - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial assets:
Cash and cash equivalents	$ 18,774,419	$ 12,493,890	$ 12,303,200	$ 41,663,405
Held-to-maturity securities	43,099	60,993
Federal Home Loan Bank stock	2,837,500	3,156,900
Mortgage loans held for sale	1,902,933	1,214,632
Loans, net	491,001,907	486,586,636
Financial liabilities:
Deposits	517,385,695	479,818,282
Securities sold under agreements to repurchase		10,000,000
Subordinated debentures	15,465,000	15,465,000
Interest payable	196,102	242,145
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	18,774,419	12,493,890
Cash and cash equivalents	18,774,419	12,493,890
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Held-to-maturity securities	43,099	60,993
Held-to-maturity securities	43,935	62,619
Federal Home Loan Bank stock	2,837,500	3,156,900
Federal Home Loan Bank stock	2,837,500	3,156,900
Mortgage loans held for sale	1,902,933	1,214,632
Mortgage loans held for sale	1,902,933	1,214,632
Interest receivable	1,986,692	2,030,058
Interest receivable	1,986,692	2,030,058
Financial liabilities:
Deposits	517,385,695	479,818,282
Deposits	511,225,380	476,519,750
FHLB and Federal Reserve advances	52,100,000	60,350,000
FHLB and Federal Reserve advances	53,227,960	61,615,252
Securities sold under agreements to repurchase		10,000,000
Securities sold under agreements to repurchase		10,371,866
Interest payable	196,102	242,145
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	491,001,907	486,586,636
Loans, net	495,207,798	487,244,753
Financial liabilities:
Subordinated debentures	15,465,000	15,465,000
Subordinated debentures	$ 15,465,000	$ 15,465,000