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Note 9 - Income Taxes Income Tax (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Net of Federal Benefit | $ 68.0 |
US Treasury Securities |  |
Operating Loss Carryforwards [Line Items] |  |
Debt Securities | 89.2 |
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Income Taxes Payable, Federal, Current | 33.4 |
REMIC Residual | Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Submitted |  | $ 31.0
Refund of Qualified Deposit Assets from U.S. Department of Treasury |  | $ 57.2
State and Local NOL Carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation Allowance, Amount | $ 67.9 |

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