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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
Income Tax Contingency [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 3,100 |  |
Unrecognized Tax Benefits, Interest and Penalties Charged to Income | 300 | $ 1,300 | $ 61,600
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of period | 37,208 | 33,552 |
Tax positions related to the current year [Abstract] |  |  |
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions | 250 | 3,215 |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | (1,788) | 0 |
Tax positions related to prior years [Abstract] |  |  |
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions | 16,568 | 441 |
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions | (171) | 0 |
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations | (31,818) | 0 |
Balance at end of period | 20,249 | $ 37,208 | $ 33,552
Unrecognized Tax Benefits, Period Increase (Decrease) | (17,000) |  |
Interest and Penalties [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 1,600 |  |

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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=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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