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Note 8 - Investment in Joint Ventures - Carrying Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying value $ 57,604 $ 45,088
CETS [Member]    
Carrying value 54,014 41,504
PVD-Expro [Member]    
Carrying value $ 3,590 $ 3,584