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Note 10 - Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | $ 17,800 |  |
Unrecognized Tax Benefits, Interest and Penalties Charged to Income |  | 1,300 | $ (61,600) | $ 2,200
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance at beginning of period | $ 37,208 | 33,552 | 123,951 |
Tax positions related to the current year [Abstract] |  |  |  |
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions |  | 3,215 | 5,058 |
Tax positions related to prior years [Abstract] |  |  |  |
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions |  | 441 | 26,465 |
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions |  | 0 | (43,146) |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 0 | (52,353) |
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations |  | 0 | (26,423) |
Balance at end of period |  | 37,208 | $ 33,552 | $ 123,951
Unrecognized Tax Benefits, Period Increase (Decrease) |  | $ 3,700 |  |
Scenario, Forecast |  |  |  |
Tax positions related to prior years [Abstract] |  |  |  |
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations | $ (7,500) |  |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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