Note 3 - Loans/Leases Receivable (Details) - Aging of the Loan/Lease Portfolio - USD ($)		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 1,689,123,535	$ 1,592,673,090
Accruing past due 90 days or more		45,483	93,411
Nonaccrual loans/leases		13,542,370	18,587,778
Loans and leases		$ 1,708,179,990	$ 1,623,338,950
Commercial Real Estate
Current as a percentage of total loan/lease portfolio		98.89%	98.11%
Accruing past due 90 days or more as a percentage of total loan/lease portfolio		0.00%	0.01%
Nonaccrual loans/leases as a percentage of total loan/lease portfolio		0.79%	1.15%
Loans and leases as a percentage of total loan/lease portfolio		100.00%	100.00%
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 3,532,045	$ 8,016,535
Commercial Real Estate
Past due as a percentage of total loan/lease portfolio		0.21%	0.49%
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 1,936,557	$ 3,968,136
Commercial Real Estate
Past due as a percentage of total loan/lease portfolio		0.11%	0.24%
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 599,328,696	$ 515,616,752
Accruing past due 90 days or more		15,775	822
Nonaccrual loans/leases		5,675,753	7,986,421
Loans and leases		$ 606,825,793	$ 523,927,140
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		39.49%	40.91%
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 1,719,643	$ 323,145
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		85,926
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases		696,122,379	702,140,422
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		256,089,271	259,166,743
Nonaccrual loans/leases		449,525	662,566
Loans and leases		$ 256,919,047	$ 260,069,080
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		3.03%	3.30%
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 117,244	$ 239,771
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		263,007
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		43,480,693	67,021,157
Nonaccrual loans/leases		313,258	256,012
Loans and leases		$ 44,706,637	$ 68,118,989
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		2.11%	1.27%
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due			$ 729,983
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 912,686	111,837
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		390,294,885	360,970,551
Accruing past due 90 days or more			60,000
Nonaccrual loans/leases		3,979,748	6,632,038
Loans and leases		$ 394,496,695	$ 373,952,353
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		26.79%	33.29%
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 222,062	$ 3,448,902
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due			2,840,862
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		168,508,788	164,059,914
Nonaccrual loans/leases		931,612	1,105,715
Loans and leases	[1],[2]	$ 170,798,682	$ 166,032,416
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		7.75%	6.66%
Finance Leases Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 1,057,914	$ 573,575
Finance Leases Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		300,368	293,212
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		160,158,002	154,303,644
Accruing past due 90 days or more			25,673
Nonaccrual loans/leases		1,420,258	1,299,545
Loans and leases	[2],[3]	$ 161,985,249	$ 158,632,492
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		12.32%	9.02%
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 47,053	$ 2,528,287
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		359,936	475,343
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		71,263,200	71,534,329
Accruing past due 90 days or more		29,708	6,916
Nonaccrual loans/leases		772,216	645,481
Loans and leases	[2]	$ 72,447,887	$ 72,606,480
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		8.50%	5.55%
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 368,129	$ 172,872
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 14,634	$ 246,882

[1] Management performs an evaluation of the estimated unguaranteed residual values of leased assets on an annual basis, at a minimum. The evaluation consists of discussions with reputable and current vendors and management's expertise and understanding of the current states of particular industries to determine informal valuations of the equipment. As necessary and where available, management will utilize valuations by independent appraisers. The large majority of leases with residual values contain a lease options rider which requires the lessee to pay the residual value directly, finance the payment of the residual value, or extend the lease term to pay the residual value. In these cases, the residual value is protected and the risk of loss is minimal. There were no losses related to residual values for the three or six months ended June 30, 2015 and 2014.

[2] 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 TDRs.

[3] Includes residential real estate loans held for sale totaling $1,548,200 and $553,000 as of June 30, 2015, and December 31, 2014, respectively.