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Schedule of Weighted-average Number of Shares Used in the Calculation of Basic and Diluted Earnings Per Share (Details) - shares	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Accounting Policies [Abstract]
Basic weighted-average number of shares	25,495,000	26,278,000
Stock options	229,000	1,000
Non-vested restricted Class B common stock	329,000	162,000
Diluted weighted-average number of shares	26,053,000	26,441,000

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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-Publisher FASB
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Number of additional shares included in diluted EPS for potentially dilutive effect of nonvested equity-based payment award containing forfeitable rights to dividends or dividend equivalents, whether paid or unpaid.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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