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Note 4 - Loans Leases Receivable (Details Textual) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Leases | 10 |  |  |
Leveraged Lease Investment | $ 929,932 |  |  |
Losses on Residual Value | 0 | $ 0 |  | $ 0
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | 645,001 | 1,135,500 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 11,441,234 | 13,919,066 |  |
Financing Receivable, Modifications, Recorded Investment | $ 9,394,967 | $ 8,647,007 |  |
Financing Receivable, Modifications, Number of Contracts | 35 | 29 |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 2,752,344 | $ 7,880,881 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 6 | 0 |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 251,940 |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 65,623 | $ 341,952 |  |
Threshold for Related Party Loans Evaluated | $ 60,000 | $ 60,000 |  | $ 60,000
Nonaccrual [Member] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 7 | 8 |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 279,245 | $ 2,008,424 |  |
Troubled Debt Restructurings [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,282,495 | 2,300,479 |  |
Residential Portfolio Segment [Member] |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage | 645,001 | 1,135,500 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,363,806 | 1,075,639 | [1] |
Residential Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 115,190 | 43,579 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,231,353 | 4,187,786 | [1] |
Commercial Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 122,598 | 48,501 |  |
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,336,871 | 1,380,047 |  |
Finance Leases Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,175,044 | 2,446,181 | [1] |
Finance Leases Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 700,255 | 816,149 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 249,091 | 87,344 | [1] |
Consumer Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 7,581 | $ 12,203 |  |
No Lease End Option Rider [Member] |  |  |  |
Number of Leases |  | 13 |  |
Leveraged Lease Investment |  | $ 1,085,164 |  |
[1] | At December 31, 2016, nonaccrual loans/leases included $2,300,479 of TDRs, including $48,501 in C&I loans, $1,380,047 in CRE loans, $816,149 in direct financing leases, $43,579 in residential real estate loans, and $12,203 in installment loans.

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