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Stock-Based Compensation (Expenses) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024	Oct. 31, 2024	Jul. 31, 2024
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs			$ 1,325,000	$ 4,834,000
Stock-based compensation expense before income tax benefit	$ 1,170,000	$ 2,189,000	1,325,000	4,834,000
Estimated Income tax benefit	(244,000)	(484,000)	(264,000)	(1,068,000)
Net stock-based compensation expense	926,000	1,705,000	1,061,000	3,766,000
Total remaining unrecognized compensation cost related to the unvested stock-based awards	7,371,000		7,371,000
Estimated forfeitures related to unvested stock-based awards	548,000		$ 548,000
Weighted average number of years net compensation cost is expected to be recognized over			2 years
Stock-based compensation capitalized and included in ending inventory	198,000		$ 198,000			$ 198,000
Stock options
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 3,000	12,000	$ 20,000	31,000
Number of stock-based awards outstanding at period end (in shares)	135,690		135,690		141,190	141,190
Performance shares
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 302,000	585,000	$ (95,000)	942,000
RSUs and restricted stock
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	850,000	1,566,000	1,371,000	3,810,000
ESPP
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 15,000	26,000	$ 29,000	51,000
Discount offered to employees participating in the ESPP as a percentage of market price			15.00%
2000 Stock Incentive Plan | Stock options
Stock-based Compensation Expenses
Number of stock-based awards outstanding at period end (in shares)	135,690		135,690
Cost of sales
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 96,000	131,000	$ 200,000	413,000
Selling, general and administrative expenses
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	1,014,000	1,991,000	1,000,000	4,167,000
Research and development expenses
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 60,000	$ 67,000	$ 125,000	$ 254,000

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