Note 3 - Loans/Leases Receivable (Details) - Aging of the Loan/Lease Portfolio - USD ($)		Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 1,730,575,481	$ 1,592,673,090
Accruing past due 90 days or more		2,411	93,411
Nonaccrual loans/leases		11,268,768	18,587,778
Loans and leases		$ 1,748,195,577	$ 1,623,338,950
Commercial Real Estate
Current as a percentage of total loan/lease portfolio		99.00%	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		0.64%	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		$ 5,472,451	$ 8,016,535
Commercial Real Estate
Past due as a percentage of total loan/lease portfolio		0.31%	0.49%
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 876,466	$ 3,968,136
Commercial Real Estate
Past due as a percentage of total loan/lease portfolio		0.05%	0.24%
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 637,545,096	$ 515,616,752
Accruing past due 90 days or more			822
Nonaccrual loans/leases		5,535,449	7,986,421
Loans and leases		$ 647,398,566	$ 523,927,140
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		46.37%	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		$ 4,169,089	$ 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		148,932
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases		692,569,134	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		246,787,360	259,166,743
Nonaccrual loans/leases		911,767	662,566
Loans and leases		$ 247,779,183	$ 260,069,080
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		7.41%	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		$ 80,056	$ 239,771
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		44,788,952	67,021,157
Nonaccrual loans/leases		222,409	256,012
Loans and leases		$ 45,011,361	$ 68,118,989
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		1.81%	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			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		$ 397,650,373	360,970,551
Accruing past due 90 days or more			60,000
Nonaccrual loans/leases		1,615,466	6,632,038
Loans and leases		$ 399,778,590	$ 373,952,353
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		13.12%	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		$ 163,163	$ 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		349,588	2,840,862
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		171,036,424	164,059,914
Nonaccrual loans/leases		1,095,488	1,105,715
Loans and leases	[1],[2]	$ 173,304,223	$ 166,032,416
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		8.90%	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		$ 892,496	$ 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		279,815	293,212
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		163,433,860	154,303,644
Accruing past due 90 days or more			25,673
Nonaccrual loans/leases		1,533,539	1,299,545
Loans and leases	[2],[3]	$ 165,060,663	$ 158,632,492
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		15.76%	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		$ 46,638	$ 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		46,626	475,343
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		69,333,416	71,534,329
Accruing past due 90 days or more		2,411	6,916
Nonaccrual loans/leases		354,650	645,481
Loans and leases	[2]	$ 69,862,991	$ 72,606,480
Commercial Real Estate
Loans and leases as a percentage of total loan/lease portfolio		6.63%	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		$ 121,009	$ 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		$ 51,505	$ 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, which is combined with 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 nine months ended September 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 $533,225 and $553,000 as of September 30, 2015, and December 31, 2014, respectively.