Note 13 - Sales and Service Revenue and Cost of Sales and Services - Breakdown of Major Customers (Details) - Customer Concentration Risk [Member] - Revenue from Contract with Customer Benchmark [Member]	3 Months Ended		9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Customer A [Member]
Customer A	0.00%	0.00%	0.00%	16.00%
Customer B [Member]
Customer A	0.00%	0.00%	0.00%	20.00%
Customer C [Member]
Customer A	0.00%	25.00%	0.00%	8.00%
Customer D [Member]
Customer A	0.00%	50.00%	0.00%	16.00%
Customer E [Member]
Customer A	0.00%	0.00%	0.00%	14.00%
Customer F [Member]
Customer A	0.00%	24.00%	0.00%	10.00%
Customer G [Member]
Customer A	0.00%	0.00%	0.00%	4.00%
Customer H [Member]
Customer A	0.00%	1.00%	100.00%	12.00%
All Customers [Member]
Customer A	0.00%	100.00%	100.00%	100.00%