Note 4 - Loans/Leases Receivable (Details) - Aging of the Loan/Lease Portfolio - USD ($)		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 1,771,618,511	$ 1,592,673,090
Accruing Past Due 90 Days or More		2,843	93,411
Nonaccrual Loans/Leases		10,648,211	18,587,778
Total		$ 1,790,286,285	$ 1,623,338,950
Current as a percentage of total loan/lease portfolio		98.96%	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		0.59%	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		$ 7,138,000	$ 8,016,535
Past due as a percentage of total loan/lease portfolio		0.40%	0.49%
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		$ 878,720	$ 3,968,136
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		$ 640,725,241	$ 515,616,752
Accruing Past Due 90 Days or More			822
Nonaccrual Loans/Leases		5,791,975	7,986,421
Total		$ 648,159,892	$ 523,927,140
Loans and leases as a percentage of total loan/lease portfolio		50.96%	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		$ 1,636,860	$ 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		5,816
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		724,368,765	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		251,612,752	259,166,743
Nonaccrual Loans/Leases		727,463	662,566
Total		$ 252,523,164	$ 260,069,080
Loans and leases as a percentage of total loan/lease portfolio		6.22%	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		$ 182,949	$ 239,771
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		48,890,040	67,021,157
Nonaccrual Loans/Leases		193,804	256,012
Total		$ 49,083,844	$ 68,118,989
Loans and leases as a percentage of total loan/lease portfolio		1.66%	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		$ 420,819,874	360,970,551
Accruing Past Due 90 Days or More			60,000
Nonaccrual Loans/Leases		1,107,768	6,632,038
Total		$ 422,761,757	$ 373,952,353
Loans and leases as a percentage of total loan/lease portfolio		9.46%	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		$ 614,732	$ 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		219,383	2,840,862
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		170,021,289	164,059,914
Accruing Past Due 90 Days or More		2,843
Nonaccrual Loans/Leases		1,701,341	1,105,715
Total	[1],[2]	$ 173,655,605	$ 166,032,416
Loans and leases as a percentage of total loan/lease portfolio		14.56%	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		$ 1,490,818	$ 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		439,314	293,212
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		166,415,118	154,303,644
Accruing Past Due 90 Days or More			25,673
Nonaccrual Loans/Leases		1,016,743	1,299,545
Total	[2],[3]	$ 170,432,530	$ 158,632,492
Loans and leases as a percentage of total loan/lease portfolio		12.12%	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		$ 2,800,589	$ 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		200,080	475,343
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		73,134,197	71,534,329
Accruing Past Due 90 Days or More			6,916
Nonaccrual Loans/Leases		109,117	645,481
Total	[2]	$ 73,669,493	$ 72,606,480
Loans and leases as a percentage of total loan/lease portfolio		5.02%	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		$ 412,052	$ 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		$ 14,127	$ 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 ofdiscussions with reputable and current vendors and management's expertise and understanding of the current states of particular industries to determine informalvaluations 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.

[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 troubled debt restructurings.

[3] Includes residential real estate loans held for sale totaling $565,850 and $553,000 as of December 31, 2015 and 2014, respectively.