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Note 5 - Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Depreciation and amortization $ 15,332 $ 17,252 $ 31,439 $ 36,970
General and Administrative Expense [Member]        
Depreciation and amortization 1,523 1,297 3,020 3,513
Service [Member]        
Depreciation and amortization 13,683 15,771 28,154 33,034
Product [Member]        
Depreciation and amortization $ 126 $ 184 $ 265 $ 423