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Note 10 - Income Taxes IRS Matter (Details) - Internal Revenue Service (IRS) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Income Tax Examination [Line Items] |
Income Tax Expense (Benefit) Recorded as a Result of Finalized IRS Settlement | $ (73.6)
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Submitted | 31.0
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Refunded | $ 57.2

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