Income Taxes - Net deferred tax asset components (Details) (USD $)	Feb. 28, 2014	Feb. 28, 2013
Income Tax Disclosure [Abstract]
Inventory	$ 103,000	$ 129,000
Allowance for accounts receivable	13,000	8,000
Accrued expenses and other	59,000	111,000
Research tax credits	117,000	100,000
Deferred tax asset	292,000	348,000
Deferred tax liability	202,000	258,000
Net deferred tax asset	$ 90,000	$ 90,000