Income Taxes - Components of Deferred Taxes (Details) - USD ($)	Aug. 31, 2020	Aug. 31, 2019
Deferred tax assets (liabilities):
Net operating loss	$ 405,000	$ 421,000
Allowance for doubtful accounts	1,000	3,000
Accrued expenses	262,000	270,000
Accrued workers' compensation	(5,000)
Accrued workers' compensation		1,000
Inventory adjustments	944,000	887,000
Unrealized losses on investment	54,000	92,000
Excess of tax over book depreciation	(850,000)	(206,000)
Other	63,000	72,000
Total deferred tax assets	874,000	1,540,000
Valuation allowance		(421,000)
Total deferred tax assets	$ 874,000	$ 1,119,000