Income Taxes - Components of Deferred Taxes (Details) - USD ($)	Aug. 31, 2019	Aug. 31, 2018
Deferred tax assets (liabilities):
Net operating loss	$ 421,000	$ 508,000
Allowance for doubtful accounts	3,000	(5,000)
Accrued expenses	270,000	209,000
Accrued workers' compensation	1,000	7,000
Inventory adjustments	887,000	708,000
Unrealized losses on investment	92,000	(7,000)
Excess of tax over book depreciation	(206,000)	(235,000)
Other	71,800	26,500
Total deferred tax assets	1,539,800	1,211,500
Valuation allowance	(421,000)	(509,000)
Total deferred tax assets	$ 1,118,500	$ 702,500