Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Feb. 29, 2012
Cost and accumulated amortization of intangible assets:
Cost	$ 6,282	$ 6,282
Accumulated Amortization	5,180	5,061
Customer lists [Member]
Cost and accumulated amortization of intangible assets:
Cost	3,611	3,611
Accumulated Amortization	2,759	2,701
Non-compete agreements [Member]
Cost and accumulated amortization of intangible assets:
Cost	1,245	1,245
Accumulated Amortization	1,245	1,245
Patents [Member]
Cost and accumulated amortization of intangible assets:
Cost	777	777
Accumulated Amortization	702	692
Other Intangible [Member]
Cost and accumulated amortization of intangible assets:
Cost	649	649
Accumulated Amortization	$ 474	$ 423