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INCOME TAXES (Details) - Deferred Tax - USD ($)
May 31, 2018
May 31, 2017
Deferred tax assets:    
Accounts receivable, principally due to allowance for doubtful accounts and sales returns $ 15,000 $ 19,000
Inventory valuation 13,000 14,000
Compensated absences and deferred payroll 49,000 62,000
Net operating loss carryforwards 923,000 968,000
Tax credit carryforwards 385,000 307,000
Deferred rent expense 5,000 6,000
Other 163,000 108,000
Accumulated depreciation and amortization 6,000
Total deferred tax assets 1,559,000 1,484,000
Less valuation allowance (1,549,000) (1,435,000)
Deferred tax asset Net 10,000 49,000
Deferred tax liabilities:    
Accumulated depreciation of property and equipment (8,000)
Net deferred tax asset $ 10,000 $ 41,000