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Note 10 - Income Taxes - Income Tax (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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US Treasury Securities |  |
Operating Loss Carryforwards [Line Items] |  |
Debt Securities | $ 275.6 | $ 210.9
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Income Taxes Payable, Federal, Current | 18.1 | $ 17.5
State and Local NOL Carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation Allowance, Amount | $ 80.7 |

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