Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Significant Accounting Policies
Allowance for doubtful accounts	$ 164,000	$ 161,000
Inventories	1,697,000	1,578,000
Securities sold, but not yet purchased	0	0
Restricted Cash	$ 0	$ 0
Maximum percentage of freight revenues	1.00%	1.00%
Cost of revenues	$ 209,060,000	$ 177,177,000
Advertising costs	427,000	415,000
Right of use assets	10,389,000	$ 11,084,000
Lease liabilities	$ 10,600,000
Antidilutive securities excluded from computation of earnings per share, amount	40,000	40,000
Convertible preferred stock (in shares)	36,000	36,000
Exchange rate on foreign currency translation and transactions	$ 0.79	$ 0.79
Canada
Significant Accounting Policies
Exchange rate on foreign currency translation and transactions	$ 0.77	$ 0.79
Percentage of total assets	3.00%	3.00%
Shipping and handling expenses
Significant Accounting Policies
Cost of revenues	$ 5,225,000	$ 4,281,000
Building
Significant Accounting Policies
Estimated useful lives	35 years
Furniture, fixtures and equipment | Minimum
Significant Accounting Policies
Estimated useful lives	5 years
Furniture, fixtures and equipment | Maximum
Significant Accounting Policies
Estimated useful lives	7 years