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Note 1 - Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
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
-
12
 
Structure
s and improvements
 
 5
-
40