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
	Oct. 31, 2024	Oct. 31, 2023
Customer A [Member]
Concentration	53.00%	0.00%
Customer B [Member]
Concentration	47.00%	0.00%
Customer C [Member]
Concentration	0.00%	100.00%
All Customers [Member]
Concentration	100.00%	100.00%