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		6 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Customer A [Member]
Customer A	0.00%	32.00%	0.00%	19.00%
Customer B [Member]
Customer A	0.00%	0.00%	0.00%	24.00%
Customer C [Member]
Customer A	0.00%	10.00%	0.00%	5.00%
Customer D [Member]
Customer A	0.00%	10.00%	0.00%	9.00%
Customer E [Member]
Customer A	0.00%	37.00%	0.00%	17.00%
Customer F [Member]
Customer A	0.00%	0.00%	0.00%	7.00%
Customer G [Member]
Customer A	0.00%	0.00%	0.00%	5.00%
Customer H [Member]
Customer A	100.00%	11.00%	100.00%	14.00%
All Customers [Member]
Customer A	100.00%	100.00%	100.00%	100.00%