CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($)	Common Stock	Additional Paid In Capital	Unrealized Gain on Marketable securities [Member]	Retained Earnings	Common Stock Held in Treasury	Total
Balance at Jul. 31, 2018	$ 2,178,297	$ 3,346,245	$ 487,136	$ 48,369,386	$ 1,287,852	$ 53,093,212
Reclassification of unrealized gains on marketable securities to retained earnings (Note 1)			(487,136)	487,136
Net income (loss)				(79,194)		(79,194)
Balance at Oct. 31, 2018	2,178,297	3,346,245		48,290,192	1,287,852	53,014,018
Net income (loss)				1,593,995		1,593,995
Balance at Jul. 31, 2019	2,178,297	3,346,245		50,371,323	1,287,852	54,608,013
Net income (loss)				128,544		128,544
Balance at Oct. 31, 2019	$ 2,178,297	$ 3,346,245		$ 50,499,867	$ 1,287,852	$ 54,736,557