Prepaid Expenses (Detail) (USD $)	May 31, 2013	Jun. 01, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Truck shop supplies	$ 445,504	$ 576,673
Insurance deposit	82,959	82,959
Prepaid marketplace spending	212,026	227,382
Prepaid insurance	257,757	159,941
Prepaid taxes and licenses	59,203	168,110
Prepaid dues and supplies	413,100	499,905
Other prepaid	84,188	39,904
Prepaid expenses	$ 1,554,737	$ 1,754,874