Note 3 - Revenue and Pre-tax Profit included in Condensed Consolidated Statements of Income (Details) - Zenith Freight Lines [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		May 28, 2016	May 30, 2015	May 28, 2016	May 30, 2015
Zenith revenue (2)	[1],[2]	$ 13,677	$ 12,086	$ 28,148	$ 15,345
Zenith pre-tax income		$ 614	$ 982	$ 1,309	$ 962	[1]

[1] From date of acquisition, February 2, 2015.

[2] Net of eliminated inter-company transactions. See Note 14.