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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

Years

 

Tractors

  5  

Trailers

  7  

Refrigerated containers

  12  

Service and other equipment

 3-15 

Buildings and improvements

 20-40