Note 8 - Contract Assets and Liabilities (Details Textual) - USD ($) $ in Millions	3 Months Ended		13 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 25, 2020	Dec. 31, 2019	Dec. 31, 2018
Contract with Customer, Liability, Revenue Recognized	$ 95.8		$ 97.1
Aggregate Affirmative Claim Recovery Estimate Included in Contract Asset and Liability	76.5			$ 71.1	$ 42.8
Performance Obligations [Member]
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price	$ 43.9	$ 38.9