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Note 8 - Investment in Joint Ventures - Carrying Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Carrying value $ 61,806 $ 57,604
CETS [Member]    
Carrying value 58,258 54,014
PVD-Expro [Member]    
Carrying value $ 3,548 $ 3,590