Note 5 - Loans Receivable (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Accretion (Amortization) of Discounts and Premiums, Investments	$ (789,290)	$ (771,804)	$ 13,233,075
Financing Receivable, Modifications, Recorded Investment	13,818,737		14,420,575
Accretion of Discount	11,037,025
FDIC Indemnification Asset, Additional Estimated Losses	1,425,814		15,976,659
FDIC Indemnification Asset, Accretion of Discount	147,674		1,461,779
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	42,000	0
Covered Loans [Member] | NCB Acquisition [Member]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	1,000,000	3,000,000
Provision for Loan Losses Expensed	52,000	600,000
Covered Loans [Member] | FNB [Member]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	30,000
Provision for Loan Losses Expensed	30,000
Covered Loans [Member] | MCB [Member]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	250,000
Provision for Loan Losses Expensed	13,000
Risk Ratings 5-8 [Member] | Minimum [Member]
Percentage of Loan Portfolio	95.00%
Risk Ratings 5-8 [Member] | Maximum [Member]
Percentage of Loan Portfolio	80.00%
Accretion Income [Member]
Other Income	86,000
Non Covered Loans [Member]
Loans and Leases Receivable, Gross, Consumer, Home Equity	14,600,000
Minimum [Member]
Debt Service Coverage Ratio	1.15
Unallocated Allowance for Loan Loss	4.00%
Maximum [Member] | Home Equity Line of Credit [Member]
Loan to Value Percentage	80.00%
Maximum [Member]
Unallocated Allowance for Loan Loss	12.00%
Commercial Real Estate [Member]
Loans Percentage Secured By Properties	31.00%
NCB Acquisition [Member]
FDIC Indemnification Asset, Additional Estimated Losses	993,000	2,400,000
MCB [Member]
FDIC Indemnification Asset, Additional Estimated Losses	237,000
MCB [Member]
FDIC Indemnification Asset, Accretion of Discount	$ 431,000