Note 3 - Loans/Leases Receivable (Details) - Loans/Leases By Credit Quality Indicators - USD ($)		Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,748,195,577	$ 1,623,338,950
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		12,311,091	20,102,407
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		647,398,566	523,927,140
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		619,562,207	491,883,568
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		15,739,256	17,034,909
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		12,097,103	15,008,663
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		5,709,520	8,223,169
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		692,569,134	702,140,422
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		247,779,183	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		237,616,448	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		8,064,486	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		2,098,249	2,193,688
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		45,011,361	68,118,989
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		42,172,844	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		1,058,517	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		399,778,590	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		386,936,606	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		4,878,807	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		7,963,177	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		911,767	662,566
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		222,409	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		1,615,466	6,692,038
Commercial and Commercial Real Estate Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 1,339,967,700	$ 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		$ 1,286,288,105	$ 1,157,394,186
As a % of Total		96.00%	94.40%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 30,462,549	$ 32,958,030
As a % of Total		2.27%	2.69%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 23,217,046	$ 35,715,346
As a % of Total		1.73%	2.91%
Finance Leases Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[1],[2]	$ 173,304,223	$ 166,032,416
Finance Leases Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	172,208,735	164,693,144
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,095,488	1,339,272
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2],[3]	165,060,663	158,632,492
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	163,120,412	156,818,091
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	1,940,251	1,814,401
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	69,862,991	72,606,480
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	69,046,801	71,491,531
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	816,190	1,114,949
Lease, Residential and Consumer Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 408,227,877	$ 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]	$ 404,375,948	$ 393,002,766
As a % of Total	[2]	99.06%	98.93%
Lease, Residential and Consumer Portfolio Segments [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	[2]	$ 3,851,929	$ 4,268,622
As a % of Total	[2]	0.94%	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, 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.