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Note 3 - Loans Leases Receivable (Details Textual) | 3 Months Ended
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Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Loans and Leases Receivable, Net of Deferred Income, Total |  | $ 3,046,799,276 |  | $ 2,956,713,493 |  |
Loans and Leases Receivable, Loss |  | 0 |  |  |  | $ 0
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 12,758,985 |  | 11,441,234 |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 7,912,975 |  | 9,394,967 |  |
Financing Receivable, Modifications, Number of Contracts |  | 3 |  |  |  | 11
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 93,844 |  |  |  | $ 809,813
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  | 8 |  |  |  | 2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  |  |  | 195,000 |  |
One Customer [Member] |  |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 78,000 |  |  |  |
Other Customers [Member] |  |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 378,000 |  |  |  |
Nonaccrual [Member] |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |  |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment |  | $ 46,320 |  |  |  | $ 0
Troubled Debt Restructurings [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 2,637,483 |  | 2,282,495 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | [1] | 1,201,085,625 |  | 1,134,516,315 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 1,448,542 |  | 1,231,353 | [2] |
Commercial Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 25,984 |  | 122,598 |  |
Commercial Portfolio Segment [Member] | m2 Lease Funds, LLC [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total |  | 78,911,791 |  | 66,758,397 |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | [3] | 254,484,231 | [4] | 258,646,265 |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage |  | 279,750 |  | 645,001 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 1,187,267 |  | 1,363,806 | [2] |
Residential Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 84,555 |  | 115,190 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total |  | 1,357,703,386 |  | 1,303,491,882 |  |
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 1,312,469 |  | 1,336,871 |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | [1],[4] | 137,614,465 |  | 141,448,232 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 2,806,398 |  | 2,175,044 | [2] |
Finance Leases Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 1,208,050 |  | 700,255 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | [4] | 95,911,569 |  | 118,610,799 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | 267,187 |  | 249,091 | [2] |
Consumer Portfolio Segment [Member] | Troubled Debt Restructurings [Member] |  |  |  |  |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  | $ 6,425 |  | $ 7,581 |  |
[1] | Includes equipment financing agreements outstanding at m2, totaling $78,911,791 and $66,758,397 as of March 31, 2018 and December 31, 2017, respectively.
[2] | Nonaccrual loans/leases included $2,282,495 of TDRs, including $122,598 in C&I loans, $1,336,871 in CRE loans, $700,255 in direct financing leases, $115,190 in residential real estate loans, and $7,581 in installment loans.
[3] | Includes residential real estate loans held for sale totaling $279,750 and $645,001 as of March 31, 2018, and December 31, 2017, respectively.
[4] | 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.

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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