Note 3 - Loans/Leases Receivable (Detail) - Delinquency Status (USD $)	Mar. 31, 2013		Dec. 31, 2012
Delinquent Loan Status	$ 996,755,858		$ 988,223,491
Performing [Member] | Leases receivable [Member]
Delinquent Loan Status	108,443,378	[1]	102,686,854	[1]
Performing [Member] | Residential Real Estate [Member]
Delinquent Loan Status	114,612,273	[1]	114,364,316	[1]
Performing [Member] | Installment and Other Consumer [Member]
Delinquent Loan Status	65,169,301	[1]	75,921,358	[1]
Performing [Member]
Delinquent Loan Status	288,224,952	[1]	292,972,528	[1]
Nonperforming [Member] | Leases receivable [Member]
Delinquent Loan Status	1,210,936	[1]	998,802	[1]
Nonperforming [Member] | Residential Real Estate [Member]
Delinquent Loan Status	935,936	[1]	1,217,257	[1]
Nonperforming [Member] | Installment and Other Consumer [Member]
Delinquent Loan Status	1,124,602	[1]	799,156	[1]
Nonperforming [Member]
Delinquent Loan Status	3,271,474	[1]	3,015,215	[1]
Delinquent Loans [Member] | Leases receivable [Member]
Delinquent Loan Status	109,654,314	[1]	103,685,656	[1]
Delinquent Loans [Member] | Residential Real Estate [Member]
Delinquent Loan Status	115,548,209	[1]	115,581,573	[1]
Delinquent Loans [Member] | Installment and Other Consumer [Member]
Delinquent Loan Status	66,293,903	[1]	76,720,514	[1]
Delinquent Loans [Member]
Delinquent Loan Status	$ 291,496,426	[1]	$ 295,987,743	[1]

[1] Performing = loans/leases accruing and less than 90 days past due. Nonperforming = loans/leases on nonaccrual, accruing loans/leases that are greater than or equal to 90 days past due, and accruing troubled debt restructurings.