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Note 8 - Investment in Joint Ventures (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Equity Method Investments [Table Text Block]
  

June 30,

  

December 31,

 
  

2022

  

2021

 

CETS

 $57,721  $54,014 

PVD-Expro

  3,527   3,590 

Total

 $61,248  $57,604