Fair Value of Financial Instruments (Details) - USD ($)	Aug. 31, 2019	Aug. 31, 2018
Marketable securities	$ 1,873,000	$ 2,846,000
Liability for short sales of trading securities	(655,000)	(933,000)
Fair Value, Inputs, Level 1 [Member]
Marketable securities	1,873,000	2,846,000
Liability for short sales of trading securities	(655,000)	(933,000)
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