Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	Feb. 29, 2012
Cost and accumulated amortization of intangible assets
Cost	$ 6,282	$ 6,282
Accumulated Amortization	5,239	5,061
Customer lists [Member]
Cost and accumulated amortization of intangible assets
Cost	3,611	3,611
Accumulated Amortization	2,788	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	708	692
Other Intangible [Member]
Cost and accumulated amortization of intangible assets
Cost	649	649
Accumulated Amortization	$ 498	$ 423