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Note 3 - Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30,
   
December 31,
 
   
2018
   
2017
 
                 
Trucks and vehicles
  $
55,193
    $
54,925
 
Water transfer equipment
   
5,148
     
4,688
 
Other equipment
   
3,164
     
3,160
 
Buildings and improvements
   
3,553
     
3,551
 
Land
   
681
     
681
 
Disposal wells
   
391
     
391
 
Total property and equipment
   
68,130
     
67,396
 
Accumulated depreciation
   
(42,010
)    
(37,979
)
Property and equipment
– net
  $
26,120
    $
29,417