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Note 3 - Revenues (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 0 $ 0
Revenue, Remaining Performance Obligation, Amount 725,100 $ 468,200
Increase (Decrease) in Contract Liabilities 256,900  
Contract With Customer Liability, Billings Paid in Advance 433,300  
Contract with Customer, Liability, Revenue Recognized $ 176,400  
Revenue Remaining Performance Obligation, Current Percentage 99.00% 99.00%
Contract with Customer, Liability, Noncurrent $ 79,900 $ 73,800