Note 7 - Restricted Cash - Restricted Cash (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jan. 31, 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
Additional surety bond collateral	0	198,377
Interest received	64	84
Restricted cash, end of period	$ 15,792,274	$ 2,037,677