Fair Value of Financial Instruments (Details) - USD ($)	Aug. 31, 2021	Aug. 31, 2020
Marketable securities	$ 3,741,000	$ 1,368,000
Liability for short sales of trading securities	0	(2,916,000)
Fair Value, Inputs, Level 1 [Member]
Marketable securities	3,741,000	1,368,000
Liability for short sales of trading securities	0	(2,916,000)
Fair Value, Inputs, Level 2 [Member]
Marketable securities	0	0
Liability for short sales of trading securities	0	0
Fair Value, Inputs, Level 3 [Member]
Marketable securities	0	0
Liability for short sales of trading securities	$ 0	$ 0