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Note 13 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income (Loss) Attributable to Parent, before Tax, Total | $ (4,000,000.0) | $ 31,600,000 | $ (4,600,000) | $ 47,300,000
Income Tax Expense (Benefit), Total | $ (870,801) | $ 7,461,038 | $ (805,328) | $ 11,077,854
Effective Income Tax Rate Reconciliation, Percent, Total | 21.90% | 23.60% | 17.70% | 23.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  | 21.00% |
Effective Income Tax Rate Reconciliation, Expiration of Stock Options, Amount |  |  | $ 200,000 |

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to expiration of stock options. + References No definition available. + Details
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