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INCOME TAXES (Details) - Deferred Tax - USD ($)
May 31, 2017
May 31, 2016
Deferred tax assets:    
Accounts receivable, principally due to allowance for doubtful accounts and sales returns $ 19,000 $ 3,000
Inventory valuation 14,000 11,000
Compensated absences and deferred payroll 62,000 60,000
Net operating loss carryforwards 968,000 705,000
Tax credit carryforwards 307,000 268,000
Deferred rent expense 6,000 3,000
Other 108,000 82,000
Total deferred tax assets 1,484,000 1,132,000
Less valuation allowance (1,435,000) (1,038,000)
Deferred tax asset Net 49,000 94,000
Deferred tax liabilities:    
Accumulated depreciation of property and equipment (8,000) (53,000)
Net deferred tax asset $ 41,000 $ 41,000