Note 3 - Loans Leases Receivable - Leases By Delinquency Status (Details) - USD ($)		Sep. 30, 2017	Dec. 31, 2016
Loans		$ 2,669,013,113	$ 2,397,414,282
Nonperforming Financial Instruments [Member]
Loans		28,428,838	21,232,408
Finance Leases Portfolio Segment [Member]
Loans	[1],[2]	147,062,893	165,419,360
Finance Leases Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	[2]	142,924,814	161,749,710
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	[2]	4,138,079	3,669,650
Residential Portfolio Segment [Member]
Loans	[2],[3]	239,957,916	229,233,104
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	[2]	238,382,845	227,277,070
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	[2]	1,575,071	1,956,034
Consumer Portfolio Segment [Member]
Loans	[2]	89,605,855	81,665,695
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	[2]	89,250,837	81,449,104
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	[2]	355,018	216,591
Lease Residential and Consumer Portfolio Segments [Member]
Loans	[2]	$ 476,626,664	$ 476,318,159
As a % of Total	[2]	100.00%	100.00%
Lease Residential and Consumer Portfolio Segments [Member] | Performing Financial Instruments [Member]
Loans	[2]	$ 470,558,496	$ 470,475,884
As a % of Total	[2]	98.73%	98.77%
Lease Residential and Consumer Portfolio Segments [Member] | Nonperforming Financial Instruments [Member]
Loans	[2]	$ 6,068,168	$ 5,842,275
As a % of Total	[2]	1.27%	1.23%

[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 and nine months ended September 30, 2017 and 2016.

[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 $290,320 and $1,135,500 as of September 30, 2017, and December 31, 2016, respectively.