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Note 5 - Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Depreciation and amortization $ 14,092 $ 15,950 $ 45,531 $ 52,920
General and Administrative Expense [Member]        
Depreciation and amortization 1,507 1,224 4,527 4,737
Service [Member]        
Depreciation and amortization 12,471 14,582 40,626 47,616
Product [Member]        
Depreciation and amortization $ 114 $ 144 $ 378 $ 567