Note 4 - Loans/Leases Receivable (Details) - Allowance for Estimated Losses on Loans/Leases (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	$ 20,769,462	$ 19,006,644	$ 19,925,204	$ 18,789,262
Balance, ending	21,156,379	18,724,535	21,156,379	18,724,535
Allowance for loans/leases individually evaluated for impairment	5,585,124		5,585,124		4,587,769
Allowance for loans/leases collectively evaluated for impairment	15,571,255		15,571,255		15,337,435
Balance, ending	21,156,379	18,724,535	21,156,379	18,724,535
Loans/leases individually evaluated for impairment	25,494,427		25,494,427		24,294,211
Loans/leases collectively evaluated for impairment	1,501,344,657		1,501,344,657		1,259,917,023
Loans/Leases receivable	1,526,839,084		1,526,839,084		1,284,211,234
Allowance as a percentage of loans/leases individually evaluated for impairment	21.91%		21.91%		18.88%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.04%		1.04%		1.22%
Allowance as a percentage of loans/leases	1.38%		1.38%		1.55%
Provisions charged to expense	1,520,137	1,048,469	2,577,919	1,828,915
Loans/leases charged off	(1,332,907)	(1,734,799)	(1,635,674)	(2,559,551)
Recoveries on loans/leases previously charged off	199,687	404,221	288,930	665,909
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	4,466,264	4,585,467	4,531,545	4,878,006
Balance, ending	4,790,828	4,180,792	4,790,828	4,180,792
Allowance for loans/leases individually evaluated for impairment	1,039,328		1,039,328		280,170
Allowance for loans/leases collectively evaluated for impairment	3,751,500		3,751,500		4,251,375
Balance, ending	4,790,828	4,180,792	4,790,828	4,180,792
Loans/leases individually evaluated for impairment	2,907,420		2,907,420		1,006,952
Loans/leases collectively evaluated for impairment	467,508,936		467,508,936		393,237,300
Loans/Leases receivable	470,416,356		470,416,356		394,244,252
Allowance as a percentage of loans/leases individually evaluated for impairment	35.75%		35.75%		27.82%
Allowance as a percentage of loans/leases collectively evaluated for impairment	0.80%		0.80%		1.08%
Allowance as a percentage of loans/leases	1.02%		1.02%		1.15%
Provisions charged to expense	348,298	(683,718)	260,491	(774,618)
Loans/leases charged off	(38,685)	(79,334)	(38,900)	(455,742)
Recoveries on loans/leases previously charged off	14,951	358,377	37,692	533,146
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	12,188,953	10,855,442	11,069,502	10,596,958
Balance, ending	12,190,497	10,709,991	12,190,497	10,709,991
Allowance for loans/leases individually evaluated for impairment	4,303,557		4,303,557		4,005,042
Allowance for loans/leases collectively evaluated for impairment	7,886,940		7,886,940		7,064,460
Balance, ending	12,190,497	10,709,991	12,190,497	10,709,991
Loans/leases individually evaluated for impairment	18,873,036		18,873,036		20,383,846
Loans/leases collectively evaluated for impairment	705,132,838		705,132,838		573,595,393
Loans/Leases receivable	724,005,874		724,005,874		593,979,239
Allowance as a percentage of loans/leases individually evaluated for impairment	22.80%		22.80%		19.65%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.12%		1.12%		1.23%
Allowance as a percentage of loans/leases	1.68%		1.68%		1.86%
Provisions charged to expense	672,077	1,275,510	1,786,371	1,533,374
Loans/leases charged off	(820,725)	(1,427,987)	(820,725)	(1,427,987)
Recoveries on loans/leases previously charged off	150,192	7,026	155,349	7,646
Leases receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	2,296,523	1,366,528	1,990,395	1,339,496
Balance, ending	2,187,605	1,610,999	2,187,605	1,610,999
Allowance for loans/leases individually evaluated for impairment	116,077		116,077		125,000
Allowance for loans/leases collectively evaluated for impairment	2,071,528		2,071,528		1,865,395
Balance, ending	2,187,605	1,610,999	2,187,605	1,610,999
Loans/leases individually evaluated for impairment	700,574		700,574		998,802
Loans/leases collectively evaluated for impairment	114,054,183		114,054,183		102,686,854
Loans/Leases receivable	114,754,757		114,754,757		103,685,656
Allowance as a percentage of loans/leases individually evaluated for impairment	16.57%		16.57%		12.51%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.82%		1.82%		1.82%
Allowance as a percentage of loans/leases	1.91%		1.91%		1.92%
Provisions charged to expense	340,137	258,469	718,760	573,915
Loans/leases charged off	(449,622)	(27,543)	(522,671)	(343,264)
Recoveries on loans/leases previously charged off	567	13,545	1,121	40,852
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	966,336	963,157	1,070,328	704,946
Balance, ending	1,165,341	986,714	1,165,341	986,714
Allowance for loans/leases individually evaluated for impairment	90,235		90,235		105,565
Allowance for loans/leases collectively evaluated for impairment	1,075,106		1,075,106		964,763
Balance, ending	1,165,341	986,714	1,165,341	986,714
Loans/leases individually evaluated for impairment	1,572,520		1,572,520		1,217,256
Loans/leases collectively evaluated for impairment	141,520,822		141,520,822		114,364,317
Loans/Leases receivable	143,093,342		143,093,342		115,581,573
Allowance as a percentage of loans/leases individually evaluated for impairment	5.74%		5.74%		8.67%
Allowance as a percentage of loans/leases collectively evaluated for impairment	0.76%		0.76%		0.84%
Allowance as a percentage of loans/leases	0.81%		0.81%		0.93%
Provisions charged to expense	195,774	23,557	204,673	286,525
Loans/leases charged off			(112,891)	(4,757)
Recoveries on loans/leases previously charged off	3,231		3,231
Installment and Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	851,386	1,236,050	1,263,434	1,269,856
Balance, ending	822,108	1,236,039	822,108	1,236,039
Allowance for loans/leases individually evaluated for impairment	35,927		35,927		71,992
Allowance for loans/leases collectively evaluated for impairment	786,181		786,181		1,191,442
Balance, ending	822,108	1,236,039	822,108	1,236,039
Loans/leases individually evaluated for impairment	1,440,877		1,440,877		687,355
Loans/leases collectively evaluated for impairment	73,127,878		73,127,878		76,033,159
Loans/Leases receivable	74,568,755		74,568,755		76,720,514
Allowance as a percentage of loans/leases individually evaluated for impairment	2.49%		2.49%		10.47%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.08%		1.08%		1.57%
Allowance as a percentage of loans/leases	1.10%		1.10%		1.65%
Provisions charged to expense	(36,149)	174,651	(392,376)	209,719
Loans/leases charged off	(23,875)	(199,935)	(140,487)	(327,801)
Recoveries on loans/leases previously charged off	$ 30,746	$ 25,273	$ 91,537	$ 84,265