Note 12 - Other Liabilities Revolving Credit Facility (Details) - Revolving Credit Facility - USD ($) $ in Millions	Mar. 31, 2019	Oct. 26, 2018	Oct. 16, 2017
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 267.5	$ 225.0
Line of Credit Facility, Maximum Borrowing Capacity			$ 300.0
Line of Credit Facility, Increase to Current Borrowing Capacity		$ 42.5
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0.0