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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Components of Deferred Tax Assets [Abstract] |  |
State income taxes, net of federal impact | $ 75,499 | $ 65,917
Goodwill and intangibles | 32,673 | 36,282
Unearned premiums | 27,703 | 34,394
Lease liability | 11,214 | 13,293
Accrued expenses | 11,140 | 11,642
Share-based compensation | 9,291 | 11,238
Deferred policy acquisition and ceding commission costs | 7,043 | 11,190
Loss reserves | 4,578 | 1,920
Other | 8,732 | 11,188
Total deferred tax assets | 187,873 | 197,064
Components of Deferred Tax Liabilities [Abstract] |  |
Differences in fair value of financial instruments | 9,087 | 5,708
Net unrealized gain on investments | 70,057 | 29,303
Depreciation | 13,029 | 12,803
Contingency reserve | 216,122 | 137,983
Other | 15,747 | 15,914
Total deferred tax liabilities | 324,042 | 201,711
Less: Valuation allowance | 77,728 | 66,437
Net deferred tax asset (liability) | $ (213,897) | $ (71,084)

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