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Note 11 - Borrowings and Financing Activities Senior Notes due 2027 (Details) - Senior Notes - Senior Notes Due 2027 - USD ($) $ in Millions | 1 Months Ended |  |
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Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument, Face Amount | $ 450.0 |  |
Proceeds from Issuance of Long-term Debt | $ 442.2 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% | 4.875% | 4.875%
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 | 0.80 |  |

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