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Income Taxes (Details 1) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Deferred income tax assets:
Bad debt reserve	$ 455	$ 535
Accrued expenses	3,758	7,888
Stock options and restricted stock	1,070	1,608
Charitable contributions	946	1,768
Depreciation	349	4,438
Unrealized gain		317
Net operating loss	75,110	122,260
Credits		2,899
Total deferred income tax assets	81,688	141,713
Valuation allowance	(76,020)	(129,872)	$ (130,498)
NET DEFERRED INCOME TAX ASSETS	$ 5,668	$ 11,841

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