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Note 3 - Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30,
   
December 31,
 
   
2019
   
2018
 
                 
Trucks and vehicles
  $
59,621
    $
59,535
 
Water transfer equipment
   
5,190
     
4,952
 
Other equipment
   
1,032
     
961
 
Buildings and improvements
   
2,955
     
2,822
 
Land
   
378
     
378
 
Disposal wells
   
-
     
400
 
Total property and equipment
   
69,176
     
69,048
 
Accumulated depreciation
   
(38,870
)    
(35,991
)
Property and equipment, 
net
  $
30,306
    $
33,057