INCOME TAXES (Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
INCOME TAXES [Abstract]
Net operating loss carryforwards	$ 10,660	$ 20,318
Depreciation, amortization and impairments	1,598	1,785
Research and development credits	9,747	8,738
Stock-based compensation	2,383	1,869
Other tax credits	917	635
Inventory reserve	502	484
Warranty reserve	752	697
Payroll and employee benefit accruals	2,421	1,797
Allowance for doubtful accounts	241	258
Other accured liabilities	2,694	2,158
Other, net	(84)	242
Gross deferred tax assets	31,831	38,981
Valuation allowance	(1,618)	(4,159)
Net deferred tax assets	$ 30,213	$ 34,822