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Note 23 - Subsequent Events - Acquisitions (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 12, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |
Aggregate principal amount |  | $ 40,210,000 | $ 40,210,000
Other borrowings |  | 72,032,318 | $ 66,000,000
London Interbank Offered Rate (LIBOR) |  |  |
Subsequent Event [Line Items] |  |  |
Variable interest rate (as a percent) | 282.00% |  |
Term Notes Member |  |  |
Subsequent Event [Line Items] |  |  |
Other borrowings |  | 23,300,000 |
Revolving line of credit |  |  |
Subsequent Event [Line Items] |  |  |
Revolving line of credit |  | 9,000,000 |
Other borrowings |  | $ 9,000,000 |
Revolving line of credit | London Interbank Offered Rate (LIBOR) |  |  |
Subsequent Event [Line Items] |  |  |
Variable interest rate (as a percent) |  | 2.50% |
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Net proceeds | $ 63,500,000 |  |
Subsequent Event [Member] | Term Notes Member |  |  |
Subsequent Event [Line Items] |  |  |
Repayments of debt | 21,400,000 |  |
Subsequent Event [Member] | Subordinated Notes Due February 15, 2029 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Aggregate principal amount | $ 65,000,000 |  |

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