Note 14 - 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, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Customer A [Member]
Concentration Risk, Percentage	67.00%	0.00%	50.00%	0.00%
Customer B [Member]
Concentration Risk, Percentage	33.00%	0.00%	24.00%	0.00%
Customer C [Member]
Concentration Risk, Percentage	0.00%	0.00%	14.00%	0.00%
Customer D [Member]
Concentration Risk, Percentage	0.00%	0.00%	12.00%	0.00%
Customer E [Member]
Concentration Risk, Percentage	0.00%	100.00%	0.00%	100.00%
All Customers [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%