Annual report pursuant to Section 13 and 15(d)

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS

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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Allowance for doubtful accounts receivable [Member]      
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Line Items]      
Balance at Beginning of Year $ 166 $ 145 $ 147
Charged (credited) to costs and expenses 28 42
Deductions 21 [1] 2 [1]
Balance at end of Year 194 166 145
Deferred tax valuation allowance [Member]      
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Line Items]      
Balance at Beginning of Year 23,527 24,471 32,581
Charged (credited) to costs and expenses 6,550 (944) (8,110)
Deductions
Balance at end of Year $ 30,077 $ 23,527 $ 24,471
[1] Write-off of uncollectible accounts receivable.