Note 11 - Business Segments (Details Textual)	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Dedicated [Member] | Minimum [Member]
Customer Contract Term	3 years
Dedicated [Member] | Maximum [Member]
Customer Contract Term	5 years
Dedicated [Member]
Depreciation, Depletion and Amortization	$ 5,000,000	$ 2,900,000
Truckload [Member]
Depreciation, Depletion and Amortization	13,700,000	13,200,000
Intermodal [Member]
Depreciation, Depletion and Amortization	941,000	1,500,000
Brokerage [Member]
Depreciation, Depletion and Amortization	$ 481,000	$ 270,000
Number of Operating Segments	5
Number of Reportable Segments	4