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Note 4 - Loans Leases Receivable - (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) lease item | Dec. 31, 2017 USD ($) lease loan contract item | Dec. 31, 2016 USD ($)
Number of Leases | lease |  | 9 |  |
Loss related to unguaranteed residual values of leases |  | $ 0 | $ 0 | $ 0
Loans and leases |  | 3,723,630,222 | 2,956,713,493 |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage |  | 1,300,000 | 645,000 |
Nonaccrual Loans/Leases |  | 14,259,739 | 11,441,234 |
Accruing TDRs |  | $ 6,465,744 | $ 9,394,967 |
Nonaccrual Loans/Leases |  | 14 | 35 |
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 4,122,953 | $ 2,752,344 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  | 5 | 6 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 398,869 | $ 251,940 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  | $ 895,563 | $ 65,623 |
Number of TDRs restructured and written off | item |  | 13 | 2 |
Threshold for Related Party Loans Evaluated |  | $ 60,000 | $ 60,000 | $ 60,000
Accruing Past Due 90 Days or More |  | $ 631,744 | $ 88,671 |
Nonaccrual [Member] |  |  |  |
Nonaccrual Loans/Leases | item |  | 3 | 7 |
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 796,320 | $ 279,245 |
Troubled Debt Restructurings [Member] |  |  |  |
Nonaccrual Loans/Leases |  | 2,311,198 | 2,282,495 |
Accruing Past Due 90 Days or More |  | 495,608 |  |
m2 Lease Funds, LLC [Member] |  |  |  |
Loans and leases |  | 103,400,000 | 66,800,000 |
Residential Portfolio Segment [Member] |  |  |  |
Loans and leases | [1] | 290,759,398 | 258,646,265 |
Loans Receivable Held-for-sale, Amount |  | 1,300,000 | 645,000 |
Nonaccrual Loans/Leases |  | 1,742,490 | 1,363,806 |
Accruing Past Due 90 Days or More |  | 89,342 | 74,519 |
Residential Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Nonaccrual Loans/Leases |  | 343,535 | 115,190 |
Commercial Portfolio Segment [Member] |  |  |  |
Loans and leases |  | 1,429,409,587 | 1,134,516,315 |
Nonaccrual Loans/Leases |  | 4,087,869 | 1,231,353 |
Accruing Past Due 90 Days or More |  | 389,138 |  |
Commercial Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Nonaccrual Loans/Leases |  | 265,181 | 122,598 |
Accruing Past Due 90 Days or More |  | 389,138 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Loans and leases |  | 1,766,110,775 | 1,303,491,882 |
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Nonaccrual Loans/Leases |  | 1,378,090 | 1,336,871 |
Accruing Past Due 90 Days or More |  | 106,470 |  |
Finance Leases Portfolio Segment [Member] |  |  |  |
Loans and leases |  | 117,968,682 | 141,448,232 |
Nonaccrual Loans/Leases |  | 1,761,022 | 2,175,044 |
Finance Leases Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Nonaccrual Loans/Leases |  | 321,050 | 700,255 |
Consumer Portfolio Segment [Member] |  |  |  |
Loans and leases |  | 119,381,780 | 118,610,799 |
Nonaccrual Loans/Leases |  | 611,306 | 249,091 |
Accruing Past Due 90 Days or More |  | 46,794 | 14,152 |
Consumer Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Nonaccrual Loans/Leases |  | 3,342 | $ 7,581 |
No Lease End Option Rider [Member] |  |  |  |
Number of Leases | lease |  |  | 10 |
Lease residual values |  | $ 828,000 | $ 930,000 |
[1] | Includes residential real estate loans held for sale totaling $1.3 million and $645 thousand as of December 31, 2018 and 2017, respectively.

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- Definition Amount of residual asset covered by residual value guarantee under direct financing lease. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
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