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Note 3 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Asphalt
 
   
Terminalling Services
 
Balance, December 31, 2017
  $
3,870
 
Acquisition
   
2,858
 
Balance, December 31, 2018
  $
6,728