Note 3 - Loans/Leases Receivable (Detail) - Nonperforming Loans/Leases (USD $)	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Nonaccrual loans/leases	$ 18,040,278		$ 17,932,495
Troubled debt restructurings - accruing			12,958,374		8,107,102
Total nonperforming loans/leases	18,345,662		24,294,211		28,880,835
Percentage of total nonperforming loans/leases	100.00%		100.00%
Nonperforming [Member] | Commercial and Industrial [Member]
Total nonperforming loans/leases	1,871,047		1,868,583
Nonperforming [Member] | Owner-occupied commercial real estate [Member]
Total nonperforming loans/leases	666,290		627,245
Nonperforming [Member] | Commercial construction, land development, and other land [Member]
Total nonperforming loans/leases	2,891,775		3,797,585
Nonperforming [Member] | Non-owner occupied Commercial Real Estate [Member]
Total nonperforming loans/leases	11,022,008		16,082,941
Nonperforming [Member] | Finance Leases Portfolio Segment [Member]
Total nonperforming loans/leases	1,210,936		998,802
Nonperforming [Member] | Residential Portfolio Segment [Member]
Total nonperforming loans/leases	935,936		1,217,257
Nonperforming [Member] | Consumer Portfolio Segment [Member]
Total nonperforming loans/leases	1,124,602		799,156
Nonperforming [Member] | Total [Member]
Total nonperforming loans/leases	19,722,594		25,391,569
Commercial and Industrial [Member]
Accruing Past Due 90 Days or More			120,000
Nonaccrual loans/leases	970,123	[1]	1,564,499	[1]
Troubled debt restructurings - accruing	900,924		184,084
Percentage of total nonperforming loans/leases	9.49%		7.36%
Owner-occupied commercial real estate [Member]
Accruing Past Due 90 Days or More	0
Nonaccrual loans/leases	618,332	[1]	627,245	[2]
Troubled debt restructurings - accruing	47,958		0
Percentage of total nonperforming loans/leases	3.38%		2.47%
Commercial construction, land development, and other land [Member]
Accruing Past Due 90 Days or More			0
Nonaccrual loans/leases	2,554,275	[1]	2,781,562	[2]
Troubled debt restructurings - accruing	337,500		1,016,023
Percentage of total nonperforming loans/leases	14.66%		14.96%
Non-owner occupied Commercial Real Estate [Member]
Accruing Past Due 90 Days or More	0
Nonaccrual loans/leases	10,737,575	[1]	10,262,176	[2]
Troubled debt restructurings - accruing	284,433		5,820,765
Percentage of total nonperforming loans/leases	55.89%		63.34%
Finance Leases Portfolio Segment [Member]
Accruing Past Due 90 Days or More	0		0
Nonaccrual loans/leases	1,210,936	[1]	998,802	[2]
Percentage of total nonperforming loans/leases	6.14%		3.93%
Residential Portfolio Segment [Member]
Accruing Past Due 90 Days or More	0
Nonaccrual loans/leases	935,936	[1]	1,049,518	[2]
Troubled debt restructurings - accruing	0		167,739
Percentage of total nonperforming loans/leases	4.75%		4.79%
Consumer Portfolio Segment [Member]
Accruing Past Due 90 Days or More	519		39,481
Nonaccrual loans/leases	1,013,101	[1]	648,693	[2]
Troubled debt restructurings - accruing	110,982		110,982
Percentage of total nonperforming loans/leases	5.70%		3.15%
Total [Member]
Accruing Past Due 90 Days or More	519		159,481
Nonaccrual loans/leases	18,040,278	[1]	17,932,495	[2]
Troubled debt restructurings - accruing	$ 1,681,797		$ 7,299,593
Percentage of total nonperforming loans/leases	100.00%		100.00%

[1] Nonaccrual loans/leases includes $6,425,305 of troubled debt restructurings, including $170,027 in commercial and industrial loans, $5,782,572 in commercial real estate loans, $228,178 in residential real estate loans, and $244,528 in installment loans.

[2] Nonaccrual loans/leases includes $5,658,781 of troubled debt restructurings, including $99,804 in commercial and industrial loans, $5,173,589 in commercial real estate loans, $64,722 in residential real estate loans, and $320,666 in installment loans.