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Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Goodwill, Impairment Loss $ 0 $ 0 $ 0 $ 57,146  
Sensitivity Analysis of Fair Value, Goodwill, Impairment Loss, Potential Increase (Decrease) on Basis Spread of Discount Rate       0.50%  
Sensitivity Analysis of Fair Value, Goodwill, Impairment Loss, Impact of 50 Basis Points Adverse Change in Discount Rate       $ 4,300  
Goodwill, Ending Balance 42,785   42,785   $ 42,785
Amortization of Intangible Assets, Total 1,200 900 2,300 2,600  
Impairment of Intangible Assets, Finite-lived 0 $ 0 0 $ 4,708  
Cementing Equipment [Member]          
Goodwill, Ending Balance 24,100   24,100    
Tubular Running Services [Member]          
Goodwill, Ending Balance $ 18,700   $ 18,700