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Note 1 - Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
Asset Class
 
Estimated Asset Life (in years)
 
             
Service vehicles
   
3
-
5
 
Office furniture and equipment
   
3
-
7
 
Revenue equipment
   
3
-
8
 
Structures and improvements
   
5
-
40