Note 10 - Long-term Debt (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Amortization of Debt Discount (Premium)	$ 0	$ 296,401	$ 524,769	$ 1,122,096
Repayments of Long-term Debt, Total			10,000,000
Credit Agreement [Member]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total	$ 0	$ 274,222	408,889	$ 1,051,111
Repayments of Long-term Debt, Total			$ 10,000,000
Third Amended and Restated Credit Agreement [Member]
Stock Issued During Period, Shares, Credit Facility (in shares)			161,594
Stock Issued During Period, Value, Credit Facility			$ 600,000