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Note 10 - Income Taxes - Income Tax (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Liabilities, Net |  | $ 166,100 | $ 71,100
2015 and 2017 Tax Years [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Credits and Adjustments | $ 0 |  |
US Treasury Securities |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Debt Securities |  | 191,900 | 134,800
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Taxes Payable, Federal, Current |  | 26,600 | $ 39,100
State and Local NOL Carryforwards |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation Allowance, Amount |  | $ 67,900 |

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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