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Note 6 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Contract with Customer, Liability, Revenue Recognized $ 17.1 $ 1.0 $ 42.3 $ 8.9
Construction [Member]        
Revenue, Remaining Performance Obligation, Amount 88.6   88.6  
Other Current Liabilities [Member]        
Contract with Customer, Liability, Current $ 28.5   $ 28.5