Marketable Securities (Tables)

6 Months Ended

Jan. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of financial assets measured at fair value on recurring basis

Fair value measurements at reporting date

	Total								Total
	January 31,								July 31,
Description	2021		Level 1		Level 2		Level 3		2020		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	3,924,076	$	3,924,076	$	–	$	–	$	3,744,905	$	3,744,905	$	–	$	–

Schedule of classified marketable securities

As of January 31, 2021 and July 31, 2020, the Company's marketable securities were classified as follows:

	January 31, 2021								July 31, 2020
			Gross		Gross						Gross		Gross
			Unrealized		Unrealized		Fair				Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
Noncurrent:
Mutual funds	$	1,457,778	$	403,275	$	4,696	$	1,856,357	$	1,077,493	$	297,064	$	–	$	1,374,557
Equity securities		1,328,147		739,572		–		2,067,719		1,553,275		823,010		5,937		2,370,348
	$	2,785,925	$	1,142,847	$	4,696	$	3,924,076	$	2,630,768	$	1,120,074	$	5,937	$	3,744,905

Schedule of investment income

Investment income consists of the following:

	Three Months Ended				Six Months Ended
	January 31				January 31
	2021		2020		2021		2020
Interest income	$	67	$	2,772		294		13,050
Dividend income		76,868		73,143		82,691		80,887
Gain on sale of marketable securities		–		–		83,176		46,981
Total	$	76,935	$	75,915	$	166,161	$	140,918