Note 15 - Income Taxes - Reconciliation of Income Tax (Details)	7 Months Ended	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Federal income tax provision rate	21.00%	21.00%	21.00%	26.87%
State income tax provision rate, net of federal income tax effect		0.72%	0.52%	0.59%
Total income tax provision rate		21.72%	21.52%	27.46%