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Note 8 - Investment in Joint Ventures (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Equity Method Investments [Table Text Block]
   

March 31,

   

December 31,

 
   

2023

   

2022

 

CETS

  $ 64,914     $ 62,471  

PVD-Expro

    3,521       3,567  

Total

  $ 68,435     $ 66,038