Note 7 - Restricted Cash - Restricted Cash (Details) - USD ($)	9 Months Ended	12 Months Ended
	Apr. 30, 2022	Jul. 31, 2021
Restricted cash, beginning of period	$ 2,037,677	$ 1,839,216
Restricted cash received from U1A Acquisition	13,754,533	0
(Release) addition of surety bond collateral	(1,754,507)	198,377
Interest received	392	84
Restricted cash, end of period	$ 14,038,095	$ 2,037,677