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Note 9 - Income Taxes Summary of Income Tax Examinations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  | $ 7,000 |
Deposit Assets |  | 88,557 | $ 88,557
Internal Revenue Service (IRS) |  |  |
Income Tax Examination [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 88,600 |
REMIC Residual | Internal Revenue Service (IRS) |  |  |
Income Tax Examination [Line Items] |  |  |
Income Tax Expense (Benefit) Recorded as a Result of Finalized IRS Settlement | $ (73,600) |  |
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Submitted |  | 31,000 |
Deposit Assets |  | 89,000 |
State and Local NOL Carryforwards [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 53,100 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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