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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Allowance for Doubtful Accounts Receivable | $ 13,400,000 | $ 9,900,000 |  | $ 13,400,000
Self Insurance Reserve | 98,000,000 | 95,000,000 |  | 98,000,000
Prepaid Insurance, Current and Noncurrent | 93,000,000 | 87,000,000 |  | 93,000,000
Available-for-sale Securities | 0 | $ 0 |  | 0
Reduction of Current Assets as Result of ASU 2015-03 [Member] |  |  |  |
Prior Period Reclassification Adjustment | 1,400,000 |  |  |
Reduction of Other Assets as Result of ASU 2015-03 [Member] |  |  |  |
Prior Period Reclassification Adjustment | 5,600,000 |  |  |
Reduction of Long-term Debt as Result of ASU 2015-03 [Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 7,000,000 |  |  |
Personal Injury and Property Damage [Member] |  |  |  |
Per Claim Self Insured Portion |  |  |  | 500,000
Workers Compensation [Member] |  |  |  |
Self Insurance Per Claim Deductible |  |  |  | $ 100,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Top 10 Customers [Member] |  |  |  |
Concentration Risk, Percentage | 29.00% | 29.00% | 28.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top 10 Customers [Member] |  |  |  |
Concentration Risk, Percentage | 28.00% | 27.00% |  |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 10.00% |  |  | 10.00%
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 30.00% |  |  | 30.00%
Tractors [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 4 years |  |  |
Tractors [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |
Trailing Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |
Trailing Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |  |
Land, Buildings and Improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |
Land, Buildings and Improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |

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