Note 4 - Loans/Leases Receivable (Details) - Allowance for Estimated Losses on Loans/Leases (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	$ 21,156,379	$ 18,724,535	$ 19,925,204	$ 18,789,262
Balance, ending	22,062,389	19,416,748	22,062,389	19,416,748
Allowance for loans/leases individually evaluated for impairment	6,493,658		6,493,658		4,587,769
Allowance for loans/leases collectively evaluated for impairment	15,568,731		15,568,731		15,337,435
Balance, ending	22,062,389	19,416,748	22,062,389	19,416,748
Loans/leases individually evaluated for impairment	23,293,188		23,293,188		24,294,211
Loans/leases collectively evaluated for impairment	1,511,984,355		1,511,984,355		1,259,917,023
Loans/Leases receivable	1,535,277,543		1,535,277,543		1,284,211,234
Allowance as a percentage of loans/leases individually evaluated for impairment	27.88%		27.88%		18.88%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.03%		1.03%		1.22%
Allowance as a percentage of loans/leases	1.43%		1.43%		1.55%
Provisions charged to expense	1,366,984	1,496,194	3,944,903	3,325,109
Loans/leases charged off	(927,637)	(1,149,730)	(2,563,311)	(3,709,281)
Recoveries on loans/leases previously charged off	466,663	345,749	755,593	1,011,658
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	4,790,828	4,180,792	4,531,545	4,878,006
Balance, ending	5,367,524	4,173,481	5,367,524	4,173,481
Allowance for loans/leases individually evaluated for impairment	1,112,008		1,112,008		280,170
Allowance for loans/leases collectively evaluated for impairment	4,255,516		4,255,516		4,251,375
Balance, ending	5,367,524	4,173,481	5,367,524	4,173,481
Loans/leases individually evaluated for impairment	2,574,217		2,574,217		1,006,952
Loans/leases collectively evaluated for impairment	468,682,757		468,682,757		393,237,300
Loans/Leases receivable	471,256,974		471,256,974		394,244,252
Allowance as a percentage of loans/leases individually evaluated for impairment	43.20%		43.20%		27.82%
Allowance as a percentage of loans/leases collectively evaluated for impairment	0.91%		0.91%		1.08%
Allowance as a percentage of loans/leases	1.14%		1.14%		1.15%
Provisions charged to expense	765,582	136,766	1,026,073	(637,852)
Loans/leases charged off	(214,920)	(214,036)	(253,820)	(669,778)
Recoveries on loans/leases previously charged off	26,034	69,959	63,726	603,105
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	12,190,497	10,709,991	11,069,502	10,596,958
Balance, ending	12,210,862	11,053,857	12,210,862	11,053,857
Allowance for loans/leases individually evaluated for impairment	4,987,850		4,987,850		4,005,042
Allowance for loans/leases collectively evaluated for impairment	7,223,012		7,223,012		7,064,460
Balance, ending	12,210,862	11,053,857	12,210,862	11,053,857
Loans/leases individually evaluated for impairment	16,517,483		16,517,483		20,383,846
Loans/leases collectively evaluated for impairment	698,183,570		698,183,570		573,595,393
Loans/Leases receivable	714,701,053		714,701,053		593,979,239
Allowance as a percentage of loans/leases individually evaluated for impairment	30.20%		30.20%		19.65%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.03%		1.03%		1.23%
Allowance as a percentage of loans/leases	1.71%		1.71%		1.86%
Provisions charged to expense	88,761	721,358	1,875,132	2,254,732
Loans/leases charged off	(443,721)	(552,959)	(1,264,446)	(1,980,946)
Recoveries on loans/leases previously charged off	375,325	175,467	530,674	183,113
Leases receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	2,187,605	1,610,999	1,990,395	1,339,496
Balance, ending	2,323,509	1,884,985	2,323,509	1,884,985
Allowance for loans/leases individually evaluated for impairment	134,533		134,533		125,000
Allowance for loans/leases collectively evaluated for impairment	2,188,976		2,188,976		1,865,395
Balance, ending	2,323,509	1,884,985	2,323,509	1,884,985
Loans/leases individually evaluated for impairment	698,588		698,588		998,802
Loans/leases collectively evaluated for impairment	120,569,409		120,569,409		102,686,854
Loans/Leases receivable	121,267,997		121,267,997		103,685,656
Allowance as a percentage of loans/leases individually evaluated for impairment	19.26%		19.26%		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	1.92%		1.92%		1.92%
Provisions charged to expense	338,984	350,194	1,057,744	924,109
Loans/leases charged off	(203,724)	(111,326)	(726,395)	(454,590)
Recoveries on loans/leases previously charged off	644	35,118	1,765	75,970
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	1,165,341	986,714	1,070,328	704,946
Balance, ending	1,267,505	1,036,909	1,267,505	1,036,909
Allowance for loans/leases individually evaluated for impairment	206,700		206,700		105,565
Allowance for loans/leases collectively evaluated for impairment	1,060,805		1,060,805		964,763
Balance, ending	1,267,505	1,036,909	1,267,505	1,036,909
Loans/leases individually evaluated for impairment	2,060,718		2,060,718		1,217,256
Loans/leases collectively evaluated for impairment	148,764,438		148,764,438		114,364,317
Loans/Leases receivable	150,825,156		150,825,156		115,581,573
Allowance as a percentage of loans/leases individually evaluated for impairment	10.03%		10.03%		8.67%
Allowance as a percentage of loans/leases collectively evaluated for impairment	0.71%		0.71%		0.84%
Allowance as a percentage of loans/leases	0.84%		0.84%		0.93%
Provisions charged to expense	102,523	233,226	307,196	519,751
Loans/leases charged off	(13,599)	(183,031)	(126,490)	(187,788)
Recoveries on loans/leases previously charged off	13,240		16,471
Installment and Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning	822,108	1,236,039	1,263,434	1,269,856
Balance, ending	892,989	1,267,516	892,989	1,267,516
Allowance for loans/leases individually evaluated for impairment	52,567		52,567		71,992
Allowance for loans/leases collectively evaluated for impairment	840,422		840,422		1,191,442
Balance, ending	892,989	1,267,516	892,989	1,267,516
Loans/leases individually evaluated for impairment	1,442,182		1,442,182		687,355
Loans/leases collectively evaluated for impairment	75,784,181		75,784,181		76,033,159
Loans/Leases receivable	77,226,363		77,226,363		76,720,514
Allowance as a percentage of loans/leases individually evaluated for impairment	3.64%		3.64%		10.47%
Allowance as a percentage of loans/leases collectively evaluated for impairment	1.11%		1.11%		1.57%
Allowance as a percentage of loans/leases	1.16%		1.16%		1.65%
Provisions charged to expense	71,134	54,650	(321,242)	264,369
Loans/leases charged off	(51,673)	(88,378)	(192,160)	(416,179)
Recoveries on loans/leases previously charged off	$ 51,420	$ 65,205	$ 142,957	$ 149,470