Note 4 - Loans/Leases Receivable (Details) - Loans/Leases By Credit Quality Indicators - USD ($)		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,790,286,285	$ 1,623,338,950
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		11,704,810	20,102,407
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		648,159,892	523,927,140
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		616,200,797	491,883,568
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		18,031,845	17,034,909
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		13,927,250	15,008,663
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,965,062	8,223,169
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		724,368,765	702,140,422
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		252,523,164	260,069,080
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		238,119,608	245,237,462
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		8,630,658	12,637,930
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,772,898	2,193,688
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		49,083,844	68,118,989
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		46,929,876	65,691,737
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,780,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		373,968	2,427,252
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		422,761,757	373,952,353
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		406,027,442	354,581,419
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		8,846,286	3,285,191
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,888,029	16,085,743
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		727,463	662,566
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		193,804	256,012
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,107,768	6,692,038
Commercial and Commercial Real Estate Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,372,528,657	$ 1,226,067,562
As a % of Total		100.00%	100.00%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,307,277,723	$ 1,157,394,186
As a % of Total		95.24%	94.40%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 37,288,789	$ 32,958,030
As a % of Total		2.72%	2.69%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 27,962,145	$ 35,715,346
As a % of Total		2.04%	2.91%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
As a % of Total		0.00%	0.00%
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[1],[2]	$ 173,655,605	$ 166,032,416
Finance Leases Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	171,951,419	164,693,144
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,704,184	1,339,272
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2],[3]	170,432,530	158,632,492
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	169,013,743	156,818,091
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,418,787	1,814,401
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	73,669,493	72,606,480
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	73,081,751	71,491,531
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	587,742	1,114,949
Lease, Residential and Consumer Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 417,757,628	$ 397,271,388
As a % of Total	[2]	100.00%	100.00%
Lease, Residential and Consumer Portfolio Segments [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 414,046,913	$ 393,002,766
As a % of Total	[2]	99.11%	98.93%
Lease, Residential and Consumer Portfolio Segments [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 3,710,715	$ 4,268,622
As a % of Total	[2]	0.89%	1.07%

[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.