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Income Taxes (Details 1) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Deferred income tax assets:
Bad debt reserve	$ 540	$ 455
Accrued expenses	3,134	3,758
Stock options and restricted stock	866	1,070
Charitable contributions	734	946
Depreciation	151	349
Unrealized gain	(231)
Net operating loss	72,625	75,110
Transaction taxes	2,000
Deferred revenue	(1,060)
Total deferred income tax assets	78,759	81,688
Valuation allowance	(74,170)	(76,020)	$ (129,872)
NET DEFERRED INCOME TAX ASSETS	$ 4,589	$ 5,668

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