Net income (loss) per share (Details) - shares	3 Months Ended		9 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Earnings Per Share [Abstract]
Potential common shares	173,000	438,000	105,000	510,000
Outstanding shares	4,097,000	1,319,000	3,627,000	1,068,000