Note 6 - Fair Value (Detail) - Assets Measured at Fair Value on a Non-recurring Basis (USD $)	Sep. 30, 2012	Dec. 31, 2011
Impaired loans/leases	$ 1,243,192,000	$ 1,202,817,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans/leases	13,367,633	18,361,757
Other real estate owned	5,403,014	9,056,619
Total	18,770,647	27,418,376
Fair Value, Inputs, Level 1 [Member]
Impaired loans/leases	0	0
Other real estate owned	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans/leases	0	0
Other real estate owned	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans/leases	13,367,633	18,361,757
Other real estate owned	5,403,014	9,056,619
Total	$ 18,770,647	$ 27,418,376