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Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Oct. 31, 2017
Oct. 31, 2016
Deferred tax assets:    
Accounts receivable, due to allowances for doubtful accounts and sales returns $ 71,085 $ 87,472
Inventories, due to allowance for damaged and slow-moving inventories and additional costs inventoried for tax purposes pursuant to the Tax Reform Act of 1986 1,088,631 999,468
Liabilities recorded for accrued expenses, deductible for tax purposes when paid 114,713 67,758
Share-based compensation expense 265,027 134,653
Investment in Centric Solutions 6,984
Net operating loss carryforwards 2,099,195 1,958,734
Other 118,119 110,773
Total gross deferred tax assets 3,756,770 3,365,842
Valuation allowance (3,622,575) (3,060,246)
Net deferred tax assets 134,195 305,596
Deferred tax liabilities:    
Plant and equipment, due to differences in depreciation and capital gain recognition (130,626) (301,590)
Other receivables, due to accrual for financial reporting purposes (3,569) (4,006)
Total gross deferred tax liabilities (134,195) (305,596)
Net deferred tax asset