INCOME TAXES (Details) - Deferred Tax - USD ($)	May. 31, 2015	May. 31, 2014
Deferred tax assets:
Accounts receivable, principally due to allowance for doubtful accounts and sales returns	$ 7,000	$ 11,000
Inventory valuation	9,000	16,000
Compensated absences and deferred payroll	45,000	39,000
Net operating loss carryforwards	484,000	325,000
Tax credit carryforwards	239,000	160,000
Deferred rent expense	13,000	21,000
Other	56,000	48,000
Total deferred tax assets	853,000	620,000
Less valuation allowance	0	0
Deferred Tax Asset Net	853,000	620,000
Deferred tax liabilities:
Accumulated depreciation of property and equipment	(109,000)	(174,000)
Net deferred tax asset	744,000	446,000
Deferred tax assets, current portion	74,000	87,000
Deferred tax assets, long-term portion	670,000	359,000
Deferred tax asset, Total	$ 744,000	$ 446,000