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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 |  |

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