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Note 4 - Loans Leases Receivable - Leases By Delinquency Status (Details) - USD ($) | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Loans |  | $ 2,956,713,493 |  | $ 2,397,414,282
Nonperforming Financial Instruments [Member] |  |  |  |
Loans |  |  | $ 18,642,377 | 21,232,408
Finance Leases Portfolio Segment [Member] |  |  |  |
Loans | [1] | 141,448,232 |  | 165,419,360
Finance Leases Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |  |
Loans |  | 137,778,740 |  | 161,749,710
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Loans |  | 3,669,492 | 3,669,492 | 3,669,650
Residential Portfolio Segment [Member] |  |  |  |
Loans | [2] | 258,646,265 |  | 229,233,104
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |  |
Loans |  | 256,935,448 |  | 227,277,070
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Loans |  | 1,710,818 | 1,710,818 | 1,956,034
Consumer Portfolio Segment [Member] |  |  |  |
Loans |  | 118,610,799 |  | 81,665,695
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |  |
Loans |  | 118,333,529 |  | 81,449,104
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Loans |  | 277,270 | $ 277,270 | 216,591
Lease Residential and Consumer Portfolio Segments [Member] |  |  |  |
Loans |  | $ 518,705,296 |  | $ 476,318,159
As a % of Total |  | 100.00% |  | 100.00%
Lease Residential and Consumer Portfolio Segments [Member] | Performing Financial Instruments [Member] |  |  |  |
Loans |  | $ 513,047,716 |  | $ 470,475,884
As a % of Total |  | 98.91% |  | 98.77%
Lease Residential and Consumer Portfolio Segments [Member] | Nonperforming Financial Instruments [Member] |  |  |  |
Loans |  | $ 5,657,580 |  | $ 5,842,275
As a % of Total |  | 1.09% |  | 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] | Includes residential real estate loans held for sale totaling $645,001 and $1,135,500 as of December 31, 2017 and 2016, respectively.

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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