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Note 6 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Contract with Customer, Liability, Revenue Recognized $ 25.2 $ 7.9
Construction [Member]    
Revenue, Remaining Performance Obligation, Amount 116.1  
Other Current Liabilities [Member]    
Contract with Customer, Liability, Current $ 62.6