INCOME TAXES (Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Feb. 28, 2013
INCOME TAXES [Abstract]
Net operating loss carryforwards	$ 31,546	$ 22,977
Depreciation, amortization and impairments	1,332	9,585
Research and development credits	7,238	6,089
Stock-based compensation	1,639	1,990
Capital loss carryforward	840	831
Other tax credits	551	636
Inventory reserve	576	534
Warranty reserve	593	515
Payroll and employee benefit accruals	1,185	469
Allowance for doubtful accounts	298	179
Other accured liabilities	1,568	343
Other, net	233	827
Gross deferred tax assets	47,599	44,975
Valuation allowance	(4,849)	(3,959)
Net deferred tax assets	42,750	41,016
Less current portion	7,619	6,400
Non-current portion	$ 35,131	$ 34,616