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Note 8 - Investment in Joint Ventures - Carrying Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Carrying value $ 71,001 $ 66,402
CETS [Member]    
Carrying value 67,343 62,704
PVD-Expro [Member]    
Carrying value $ 3,658 $ 3,698