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Note 8 - Investment in Joint Ventures (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Equity Method Investments [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 

CETS

 $58,258  $54,014 

PVD-Expro

  3,548   3,590 

Total

 $61,806  $57,604