Note 11 - Fair Value of Financial Instruments and Fair Value Measurement (Detail) - Fair Value Balance Sheet Financial Instruments (USD $)	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Financial assets:
Cash and cash equivalents	$ 130,247,600	$ 108,828,220	$ 78,815,388	$ 149,761,646
Cash and cash equivalents	130,247,600
Investments available for sale	179,246,182	189,379,333
Investments available for sale	179,246,182	189,379,333
FHLB Stock	5,273,200	5,318,200
FHLB Stock	5,273,200	5,318,200
Loans receivable, net	575,638,347	593,903,715	441,933,683
Loans receivable, net	544,181,243	561,448,457
Loans held for sale	4,923,431	2,691,508
Loans held for sale	5,034,155	2,741,672
Cash surrender value of life insurance	34,087,206	33,831,920
Cash surrender value of life insurance	34,087,206	33,831,920
FDIC receivable for loss sharing arrangements	42,838,335	35,492,184
Accrued interest and dividends receivable	2,880,248	3,241,320
Accrued interest and dividends receivable	2,880,248	3,241,320
Financial liabilities:
Deposits	806,117,639	800,261,546
Deposits	811,316,288	805,422,429
FHLB advances and other borrowings	80,000,000	81,000,000
FHLB advances and other borrowings	89,012,324	90,732,925
Derivative instruments		12,443
Derivative instruments		12,443
Accrued interest payable	284,341	320,980
Accrued interest payable	284,341	320,980
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents		108,828,220
Cash and Cash Equivalents [Member]
Financial assets:
Cash and cash equivalents		108,828,220
Cash and cash equivalents		108,828,220
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	130,247,600
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Investments available for sale	179,246,182	189,379,333
FHLB Stock	5,273,200	5,318,200
Loans held for sale	5,034,155	2,741,672
Cash surrender value of life insurance	34,087,206	33,831,920
Accrued interest and dividends receivable	587,434	721,048
Financial liabilities:
Deposits	811,316,288	805,422,429
FHLB advances and other borrowings	89,012,324	90,732,925
Derivative instruments		12,443
Accrued interest payable	284,341	320,980
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans receivable, net	544,181,243	561,448,457
FDIC receivable for loss sharing arrangements	42,838,335	35,492,184
Accrued interest and dividends receivable	$ 2,292,814	$ 2,520,272