INCOME TAXES (Details) - Deferred Tax - USD ($)	May 31, 2016	May 31, 2015
Deferred tax assets:
Accounts receivable, principally due to allowance for doubtful accounts and sales returns	$ 3,000	$ 7,000
Inventory valuation	11,000	9,000
Compensated absences and deferred payroll	60,000	45,000
Net operating loss carryforwards	705,000	484,000
Tax credit carryforwards	268,000	239,000
Deferred rent expense	3,000	13,000
Other	82,000	56,000
Total deferred tax assets	1,132,000	853,000
Less valuation allowance	(1,038,000)	0
Deferred Tax Asset Net	94,000	853,000
Deferred tax liabilities:
Accumulated depreciation of property and equipment	(53,000)	(109,000)
Net deferred tax asset	$ 41,000	$ 744,000