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Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Oct. 31, 2018
Oct. 31, 2017
Accounts receivable, due to allowances for doubtful accounts and sales returns $ 36,779 $ 71,085
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 780,446 1,088,631
Liabilities recorded for accrued expenses, deductible for tax purposes when paid 472,641 114,713
Share-based compensation expense 474,163 265,027
Net operating loss carryforwards 528,939 2,099,195
AMT credit carryforwards 49,281
Other 59,219 118,119
Total gross deferred tax assets 2,401,468 3,756,770
Valuation allowance (2,118,487) (3,622,575)
Net deferred tax assets 282,981 134,195
Deferred tax liabilities:    
Plant and equipment, due to differences in depreciation and capital gain recognition (231,672) (130,626)
Other receivables, due to accrual for financial reporting purposes (2,028) (3,569)
Total gross deferred tax liabilities (233,700) (134,195)
Net deferred tax asset $ 49,281