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Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2016
Accounting Standards Update 2016-09 [Member] |  |  |
Current Period Reclassification Adjustment |  | $ 2,200 |
Previously Unrecognized Tax Benefits Resulting from Operating Loss Carryovers [Member] | March 31, 2016 [Member] |  |  |
Prior Period Reclassification Adjustment | $ 600 |  |
Tractors [Member] | Salvage Value [Member] |  |  |
Depreciation, Additional Expense | 2,000 |  |
Depreciation, Additional Expense, After Tax | $ 1,200 |  |
Effect of Additional Depreciation Expense on Earnings Per Share | $ (0.06) |  |
Tractors [Member] |  |  |
Property, Plant and Equipment, Useful Life |  |  | 5 years
Property, Plant and Equipment, Salvage Value, Percentage | 25.00% |  | 25.00%
Refrigerated Trailers [Member] |  |  |
Property, Plant and Equipment, Useful Life |  |  | 6 years
Dry Van Trailers [Member] |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years
Property, Plant and Equipment, Salvage Value, Percentage | 38.00% |  | 38.00%
Revenue Equipment [Member] | Minimum [Member] |  |  |
Capital Leases of Lessee, Term of Contract |  |  | 5 years
Revenue Equipment [Member] | Maximum [Member] |  |  |
Capital Leases of Lessee, Term of Contract |  |  | 7 years
Prior Period Reclassification Adjustment |  |  | $ 2,247

X
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