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Note 2 - Details of Consolidated Balance Sheet Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
(In thousands)
 
20
15
 
  
2014
  
Tires in service
 
$
5,064
 
   $ 4,438  
License fees
 
 
4,921
 
     4,397  
Parts and tires inventory
 
 
4,011
 
     3,754  
Insurance premiums
 
 
1,730
 
     1,537  
Other
 
 
2,408
 
     2,734  
 
 
$
18,134
 
   $ 16,860  
Schedule of Accrued Liabilities [Table Text Block]
(In thousands)
 
2015
 
  
2014
  
Accrued expenses
 
$
7,940
 
   $ 5,536  
Vacation
 
 
4,782
 
     4,301  
Accrued liability to MWL
 
 
4,284
 
     466  
Salaries and wages
 
 
2,644
 
     1,204  
Other
 
 
1,984
 
     1,203  
 
 
$
21,634
 
   $ 12,710