Note 3 - Loans/Leases Receivable (Details) - Loans/Leases By Credit Quality Indicators - USD ($)		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,708,179,990	$ 1,623,338,950
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		14,853,918	20,102,407
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		606,825,793	523,927,140
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		576,067,054	491,883,568
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		18,480,974	17,034,909
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		12,277,765	15,008,663
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,866,552	8,223,169
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		696,122,379	702,140,422
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		256,919,047	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		245,725,433	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		9,396,349	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		1,797,265	2,193,688
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		44,706,637	68,118,989
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		41,653,406	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		1,273,231	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		394,496,695	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		379,720,588	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		5,436,144	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		9,339,963	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		449,525	662,566
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		313,258	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		3,979,748	6,692,038
Commercial and Commercial Real Estate Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,302,948,172	$ 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		$ 1,243,166,481	$ 1,157,394,186
As a % of Total		95.42%	94.40%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 35,093,467	$ 32,958,030
As a % of Total		2.69%	2.69%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 24,688,224	$ 35,715,346
As a % of Total		1.89%	2.91%
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[1],[2]	$ 170,798,682	$ 166,032,416
Finance Leases Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	169,647,689	164,693,144
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,150,993	1,339,272
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2],[3]	161,985,249	158,632,492
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	160,154,508	156,818,091
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,830,742	1,814,401
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	72,447,887	72,606,480
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	71,184,787	71,491,531
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,263,100	1,114,949
Lease, Residential and Consumer Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 405,231,818	$ 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]	$ 400,986,984	$ 393,002,766
As a % of Total	[2]	98.95%	98.93%
Lease, Residential and Consumer Portfolio Segments [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 4,244,834	$ 4,268,622
As a % of Total	[2]	1.05%	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 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.