Fair Value of Financial Instruments (Details) - USD ($)	Aug. 31, 2018	Aug. 31, 2017
Marketable securities	$ 2,846,000	$ 1,596,000
Liability for short sales of trading securities	(933,000)	(707,000)
Fair Value, Inputs, Level 1 [Member]
Marketable securities	2,846,000	1,596,000
Liability for short sales of trading securities	(933,000)	(707,000)
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