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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Years
 
Tractors
 
 
5
 
 
Trailers
 
 
7
 
 
Service and other equipment
 
 3
-
15
 
Buildings and improvements
 
 20
-
40