Significant Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Bad debt reserve	$ 1,011	$ 854
Accrued expenses	3,456	2,963
Stock options and restricted stock	980	1,226
Charitable contributions	778	659
Depreciation	(373)	(71)
Unrealized gain	(1,826)	(302)
Net operating loss	49,368	62,588
Deferred revenue	(352)	(705)
Total deferred income tax assets	53,042	67,212
Valuation allowance	(11,540)	(58,700)	$ (74,170)
NET DEFERRED INCOME TAX ASSETS	$ 41,502	$ 8,512

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards.

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