Income Taxes (Provision for Income Taxes) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Income Tax Disclosure [Abstract]
Federal - current	$ 1,053,000	$ (2,190,000)	$ 367,000
Federal - deferred	721,000	4,782,000	(7,499,000)
State and local - current	1,137,000	1,715,000	440,000
State and local - deferred	(1,312,000)	(321,000)	1,115,000
Foreign - current	298,000	62,000	429,000
Foreign - deferred	393,000	(179,000)	5,000
Provision for (benefit from) income taxes	$ 2,290,000	$ 3,869,000	$ (5,143,000)