Note 3 - Loans/Leases Receivable (Detail) - Allowance for Estimated Losses on Loans/Leases (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Total Loans/leases	$ 1,194,579,266		$ 1,194,579,266		$ 1,181,956,235
Provisions charged to expense	1,048,469	1,672,221	1,828,915	2,739,885
Commercial and Industrial [Member]
Balance, beginning	4,585,467	8,454,099	4,878,006	7,548,922	7,548,922
Balance, ending	4,180,792	7,124,444	4,180,792	7,124,444	4,878,006
Loans/leases individually evaluated for impairment	1,011,904		1,011,904		2,152,855
Loans/leases collectively evaluated for impairment	349,768,513		349,768,513		348,641,423
Total Loans/leases	350,780,417		350,780,417		350,794,278
Allowance as a percentage of loans/leases individually evaluated for impairment	26.19%		26.19%		41.95%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.12%		1.12%		1.14%
Total allowance as a percentage of loans/leases	1.19%		1.19%		1.39%
Allowance for loans/leases individually evaluated for impairment	265,046		265,046		903,187
Allowance for loans/leases collectively evaluated for impairment	3,915,746		3,915,746		3,974,819
Provisions charged to expense	(683,718)	224,974	(774,618)	1,216,493
Loans/leases charged off	(79,334)	(1,593,901)	(455,742)	(1,790,617)
Recoveries on loans/leases previously charged off	358,377	39,272	533,146	149,646	4,878,006
Commercial Real Estate Portfolio Segment [Member]
Balance, beginning	10,855,442	8,631,699	10,596,958	9,087,315	9,087,315
Balance, ending	10,709,991	8,602,639	10,709,991	8,602,639	10,596,958
Loans/leases individually evaluated for impairment	21,305,295		21,305,295		24,281,365
Loans/leases collectively evaluated for impairment	554,982,003		554,982,003		553,522,485
Total Loans/leases	576,287,298		576,287,298		577,803,850
Allowance as a percentage of loans/leases individually evaluated for impairment	14.91%		14.91%		17.70%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.36%		1.36%		1.14%
Total allowance as a percentage of loans/leases	1.86%		1.86%		1.83%
Allowance for loans/leases individually evaluated for impairment	3,175,726		3,175,726		4,297,738
Allowance for loans/leases collectively evaluated for impairment	7,534,265		7,534,265		6,299,220
Provisions charged to expense	1,275,510	865,054	1,533,374	392,902
Loans/leases charged off	(1,427,987)	(921,407)	(1,427,987)	(921,537)
Recoveries on loans/leases previously charged off	7,026	27,293	7,646	43,959	10,596,958
Finance Leases Portfolio Segment [Member]
Balance, beginning	1,366,528	1,467,934	1,339,496	1,530,572	1,530,572
Balance, ending	1,610,999	1,591,309	1,610,999	1,591,309	1,339,496
Loans/leases individually evaluated for impairment	687,508		687,508		1,306,663
Loans/leases collectively evaluated for impairment	97,880,074		97,880,074		91,905,699
Total Loans/leases	98,567,582		98,567,582		93,212,362
Allowance as a percentage of loans/leases individually evaluated for impairment	13.09%		13.09%		5.10%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.55%		1.55%		1.38%
Total allowance as a percentage of loans/leases	1.63%		1.63%		1.44%
Allowance for loans/leases individually evaluated for impairment	90,000		90,000		66,675
Allowance for loans/leases collectively evaluated for impairment	1,520,999		1,520,999		1,272,821
Provisions charged to expense	258,469	123,221	573,915	303,885
Loans/leases charged off	(27,543)		(343,264)	(243,446)
Recoveries on loans/leases previously charged off	13,545	154	40,852	298	1,339,496
Residential Portfolio Segment [Member]
Balance, beginning	963,157	706,305	704,946	748,028	748,028
Balance, ending	986,714	757,075	986,714	757,075	704,946
Loans/leases individually evaluated for impairment	1,191,136		1,191,136		1,133,474
Loans/leases collectively evaluated for impairment	106,259,361		106,259,361		96,973,577
Total Loans/leases	107,450,497		107,450,497		98,107,051
Allowance as a percentage of loans/leases individually evaluated for impairment	9.90%		9.90%		4.93%
Allowance as a percentage of loans/leases collectively evaluated for impairment	0.82%		0.82%		0.67%
Total allowance as a percentage of loans/leases	0.92%		0.92%		0.72%
Allowance for loans/leases individually evaluated for impairment	117,877		117,877		55,884
Allowance for loans/leases collectively evaluated for impairment	868,837		868,837		649,062
Provisions charged to expense	23,557	50,770	286,525	9,047
Loans/leases charged off		0	(4,757)	0
Recoveries on loans/leases previously charged off		0		0	704,946
Consumer Portfolio Segment [Member]
Balance, beginning	1,236,050	1,469,979	1,269,856	1,449,819	1,449,819
Balance, ending	1,236,039	1,727,165	1,236,039	1,727,165	1,269,856
Loans/leases individually evaluated for impairment	965,678		965,678		984,806
Loans/leases collectively evaluated for impairment	76,451,135		76,451,135		77,238,274
Total Loans/leases	77,416,813		77,416,813		78,223,080
Allowance as a percentage of loans/leases individually evaluated for impairment	0.24%		0.24%		2.32%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.61%		1.61%		1.61%
Total allowance as a percentage of loans/leases	1.60%		1.60%		1.62%
Allowance for loans/leases individually evaluated for impairment	2,313		2,313		22,819
Allowance for loans/leases collectively evaluated for impairment	1,233,726		1,233,726		1,247,037
Provisions charged to expense	174,651	408,202	209,719	817,558
Loans/leases charged off	(199,935)	(176,397)	(327,801)	(617,032)
Recoveries on loans/leases previously charged off	25,273	25,381	84,265	76,820	1,269,856
Total [Member]
Balance, beginning	19,006,644	20,730,016	18,789,262	20,364,656	20,364,656
Balance, ending	18,724,535	19,802,632	18,724,535	19,802,632	18,789,262
Loans/leases individually evaluated for impairment	25,161,521		25,161,521		29,859,163
Loans/leases collectively evaluated for impairment	1,185,341,086		1,185,341,086		1,168,281,458
Total Loans/leases	1,210,502,607		1,210,502,607		1,198,140,621
Allowance as a percentage of loans/leases individually evaluated for impairment	14.51%		14.51%		17.91%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.27%		1.27%		1.15%
Total allowance as a percentage of loans/leases	1.54%		1.54%		1.56%
Allowance for loans/leases individually evaluated for impairment	3,650,962		3,650,962		5,346,303
Allowance for loans/leases collectively evaluated for impairment	15,073,573		15,073,573		13,442,959
Provisions charged to expense	1,048,469	1,672,221	1,828,915	2,739,885
Loans/leases charged off	(1,734,799)	(2,691,705)	(2,559,551)	(3,572,632)
Recoveries on loans/leases previously charged off	$ 404,221	$ 92,100	$ 665,909	$ 270,723	$ 18,789,262