Note 16 - Income Taxes - Reconciliation of Income Tax (Details)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Federal income tax provision rate	21.00%	21.00%
State income tax provision rate, net of federal income tax effect	0.83%	0.72%
Total income tax provision rate	21.83%	21.72%