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Note 9 - Income Taxes Income Tax (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Liabilities, Net | $ 90.5 | $ 71.1
US Treasury Securities |  |
Operating Loss Carryforwards [Line Items] |  |
Debt Securities | 134.8 | 134.8
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Income Taxes Payable, Federal, Current | 42.4 | $ 39.1
State and Local NOL Carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation Allowance, Amount | $ 67.4 |

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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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