Note 8 - Disclosures about Fair Value of Assets and Liabilities (Details) - Fair Value of Financial Instruments - USD ($)	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financial assets:
Cash and cash equivalents	$ 21,417,331	$ 12,493,890	$ 20,831,026	$ 12,303,200
Held-to-maturity securities	51,341	60,993
Federal Home Loan Bank stock	2,837,500	3,156,900
Mortgage loans held for sale	1,618,290	1,214,632
Loans, net	504,632,124	486,586,636
Financial liabilities:
Deposits	519,547,082	479,818,282
Securities sold under agreements to repurchase		10,000,000
Subordinated debentures	15,465,000	15,465,000
Interest payable	195,937	242,145
Interest payable, fair value	195,937	242,145
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	21,417,331	12,493,890
Cash and cash equivalents, fair value	21,417,331	12,493,890
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Held-to-maturity securities	51,341	60,993
Held-to-maturity securities, fair value	52,720	62,619
Federal Home Loan Bank stock	2,837,500	3,156,900
Federal Home Loan Bank stock, fair value	2,837,500	3,156,900
Mortgage loans held for sale	1,618,290	1,214,632
Mortgage loans held for sale, fair value	1,618,290	1,214,632
Interest receivable	2,085,322	2,030,058
Interest receivable, fair value	2,085,322	2,030,058
Financial liabilities:
Deposits	519,547,082	479,818,282
Deposits, fair value	516,151,059	476,519,750
Federal Home Loan Bank and Federal Reserve Bank advances	52,100,000	60,350,000
Federal Home Loan Bank and Federal Reserve Bank advances, fair value	53,565,166	61,615,252
Securities sold under agreements to repurchase		10,000,000
Securities sold under agreements to repurchase		10,371,866
Interest payable	195,937	242,145
Interest payable, fair value	195,937	242,145
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	504,632,124	486,586,636
Loans, net, fair value	504,621,172	487,244,753
Financial liabilities:
Subordinated debentures	15,465,000	15,465,000
Subordinated debentures, fair value	$ 15,465,000	$ 15,465,000