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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill, Impairment Loss   $ 0      
Amortization of Intangible Assets, Total $ 37,600   $ 41,500 $ 133,100 $ 123,600
Energy and Specialized Markets [Member]          
Goodwill, Period Increase (Decrease), Total       $ 15,800