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Note 9 - Income Taxes Summary of Income Tax Examinations (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 30, 2018 | Sep. 04, 2014 | May 31, 2010 | Jun. 30, 2008
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  | $ 27,956 | $ 38,198 |  |  |  |
REMIC Residual [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Qualified Deposit With The U.S. Department Of Treasury Relating to Tax Years 2000 Through 2004 |  |  |  |  |  |  | $ 85,000
Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007 |  |  |  |  |  | $ 4,000 |
Income Tax Examination, Penalties Accrued |  |  |  |  | $ 157,000 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Reduction to Available Holding Company Liquidity |  |  |  | $ 35,000 |  |  |
Income Tax Expense (Benefit) | $ (30,000) |  |  |  |  |  |

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