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Note 8 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 20, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit) | $ 1,823,367 | $ 2,492,649 | $ 2,780,908 | $ 6,476,012 |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 5,300,000 | $ 7,200,000 | 13,900,000 | $ 19,700,000 |  |
Unrecognized Tax Benefits | 0 |  | 0 |  |  | $ 100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 |  | 0 |  |  | $ 0
eNom, Incorporated [Member] |  |  |  |  |  |
Deferred Tax Liabilities, Net |  |  |  |  | $ 21,900,000 |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (400,000) |  | $ (2,600,000) |  |  |

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