Note 11 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Balance, beginning of year	$ 10,075	$ 19,869
Amortization of discount and accrued fees	525	1,376	$ 1,670
Payment of anniversary fees	(600)	(1,170)
Principal repayment	(10,000)	(10,000)
Balance, end of year	$ 0	$ 10,075	$ 19,869