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Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Oct. 31, 2020
Oct. 31, 2019
Accounts receivable, due to allowances for doubtful accounts and sales returns $ 139,809 $ 54,370
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 764,183 769,871
Liabilities recorded for accrued expenses, deductible for tax purposes when paid 294,857 111,677
Share-based compensation expense 16,814 20,410
Section 163(j) interest 254,520 121,583
Expenses incurred related to expected PPP Loan forgiveness 1,162,161 0
Net operating loss carryforwards 2,163,956 2,374,774
AMT credit carryforwards 25,003 50,007
Other 53,136 53,997
Total gross deferred tax assets 4,874,439 3,556,689
Valuation allowance (4,759,862) (3,348,645)
Net deferred tax assets 114,577 208,044
Plant and equipment, due to differences in depreciation and capital gain recognition (86,997) (155,461)
Other receivables, due to accrual for financial reporting purposes (2,577) (2,576)
Total gross deferred tax liabilities (89,574) (158,037)
Net deferred tax asset $ 25,003 $ 50,007