Note 8 - Disclosures about Fair Value of Assets and Liabilities (Details) - Fair Value of Financial Instruments (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Financial assets:
Cash and cash equivalents	$ 23,855,188	$ 41,663,405	$ 26,071,791	$ 26,574,082
Held-to-maturity securities	89,213	181,042
Held-to-maturity securities	94,222
Federal Home Loan Bank stock	3,147,400	3,805,500
Mortgage loans held for sale	1,296,003	2,843,757
Loans, net	459,646,868	465,531,973
Financial liabilities:
Deposits	511,889,458	500,014,715
Federal Home Loan Bank advances	52,950,000	68,050,000
Securities sold under agreements to repurchase	10,000,000	25,000,000
Subordinated debentures, carrying amount	15,465,000	15,465,000
Interest payable	270,904	399,684
Commitments to Extend Credit [Member]
Unrecognized financial instruments (net of contractual value):
Commitments to extend credit	0	0
Commitments to extend credit	0	0
Unused lines of Credit [Member]
Unrecognized financial instruments (net of contractual value):
Commitments to extend credit	0	0
Commitments to extend credit	0	0
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	23,855,188	41,663,405
Cash and cash equivalents	23,855,188	41,663,405
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Held-to-maturity securities	89,213	181,042
Held-to-maturity securities	94,222	193,482
Federal Home Loan Bank stock	3,147,400	3,805,500
Mortgage loans held for sale	1,296,003	2,843,757
Mortgage loans held for sale	1,296,003	2,843,757
Interest receivable	2,003,836	2,055,369
Financial liabilities:
Deposits	511,889,458	500,014,715
Deposits	503,670,848	500,580,070
Federal Home Loan Bank advances	52,950,000	68,050,000
Federal Home Loan Bank advances	54,946,144	72,035,160
Securities sold under agreements to repurchase	10,000,000	25,000,000
Securities sold under agreements to repurchase	10,049,349	25,114,464
Interest payable	270,904	399,684
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	459,646,868	465,531,973
Loans, net	463,101,272	475,374,676
Financial liabilities:
Subordinated debentures, carrying amount	15,465,000	15,465,000
Subordinated debentures, fair value	$ 15,465,000	$ 15,465,000