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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Income Tax Disclosure [Abstract]      
Federal - current $ 608,000 $ 1,053,000 $ (2,190,000)
Federal - deferred (877,000) 721,000 4,782,000
State and local - current 466,000 1,137,000 1,715,000
State and local - deferred (598,000) (1,312,000) (321,000)
Foreign - current 688,000 298,000 62,000
Foreign - deferred (1,787,000) 393,000 (179,000)
(Benefit from) provision for income taxes $ (1,500,000) $ 2,290,000 $ 3,869,000