INCOME TAXES (Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Feb. 28, 2014
INCOME TAXES [Abstract]
Net operating loss carryforwards	$ 20,318	$ 31,546
Depreciation, amortization and impairments	1,785	1,332
Research and development credits	8,738	7,238
Stock-based compensation	1,869	1,639
Capital loss carryforward		840
Other tax credits	635	551
Inventory reserve	484us-gaap_DeferredTaxAssetsInventory	576us-gaap_DeferredTaxAssetsInventory
Warranty reserve	697	593
Payroll and employee benefit accruals	1,797	1,185
Allowance for doubtful accounts	258	298
Other accured liabilities	2,158	1,568
Other, net	242us-gaap_DeferredTaxAssetsOther	233us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	38,981us-gaap_DeferredTaxAssetsGross	47,599us-gaap_DeferredTaxAssetsGross
Valuation allowance	(4,159)	(4,849)
Net deferred tax assets	34,822us-gaap_DeferredTaxAssetsNet	42,750us-gaap_DeferredTaxAssetsNet
Less current portion	11,367us-gaap_DeferredTaxAssetsNetCurrent	7,619us-gaap_DeferredTaxAssetsNetCurrent
Non-current portion	$ 23,455us-gaap_DeferredTaxAssetsNetNoncurrent	$ 35,131us-gaap_DeferredTaxAssetsNetNoncurrent

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319