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Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Oct. 31, 2019 | Oct. 31, 2018
--- | --- | ---
Accounts receivable, due to allowances for doubtful accounts and sales returns | $ 54,370 | $ 36,779
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 | 769,871 | 780,446
Liabilities recorded for accrued expenses, deductible for tax purposes when paid | 111,677 | 472,641
Share-based compensation expense | 20,410 | 474,163
Net operating loss carryforwards | 2,374,774 | 528,939
AMT credit carryforwards | 50,007 | 49,281
Other | 175,580 | 59,219
Total gross deferred tax assets | 3,556,689 | 2,401,468
Valuation allowance | (3,348,645) | (2,118,487)
Net deferred tax assets | 208,044 | 282,981
Plant and equipment, due to differences in depreciation and capital gain recognition | (155,461) | (231,672)
Other receivables, due to accrual for financial reporting purposes | (2,576) | (2,028)
Total gross deferred tax liabilities | (158,037) | (233,700)
Net deferred tax asset | $ 50,007 | $ 49,281

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