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Note 11 - Borrowings and Financing Activities - Senior Notes due 2025 (Details) - Senior Notes - Senior Notes Due 2025 - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
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May 31, 2020 | Jun. 30, 2020
Debt Instrument, Face Amount | $ 525,000 |
Proceeds from Issuance of Long-term Debt | $ 515,600 |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |
Debt Instrument, Redemption Price, Percentage | 100.00% |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50%
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions | 80.00% |

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