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Note 3 - Revenues (Details Textual) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Amount $ 533.8 $ 443.2
Increase (Decrease) in Contract Liabilities 90.6  
Contract With Customer Liability, Billings Paid in Advance 405.6  
Contract with Customer, Liability, Revenue Recognized $ 315.0  
Revenue Remaining Performance Obligation, Current Percentage 98.00% 99.00%
Contract with Customer, Liability, Noncurrent $ 71.0 $ 63.7