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Note 5 - Property and Equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 5 - Property and Equipment (Details) [Line Items]      
Depreciation $ 44,200,000 $ 47,800,000 $ 52,600,000
Gain (Loss) on Disposition of Property Plant Equipment (81,000) (198,000) (562,000)
Capital Leased Assets, Gross 29,400,000 21,300,000  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 7,600,000 5,500,000  
Capital Leases, Income Statement, Amortization Expense 2,200,000 2,100,000 1,800,000
Revenue Equipment [Member] | Minimum [Member]
      
Note 5 - Property and Equipment (Details) [Line Items]      
Capital Leases of Lessee, Term of Contract 60 months    
Revenue Equipment [Member] | Maximum [Member]
      
Note 5 - Property and Equipment (Details) [Line Items]      
Capital Leases of Lessee, Term of Contract 84 months    
Net In Depreciation And Amortization Expense [Member]
      
Note 5 - Property and Equipment (Details) [Line Items]      
Gain (Loss) on Disposition of Property Plant Equipment $ 800,000 $ 4,900,000 $ 6,700,000