Note 10 - Long-term Debt (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Amortization of Debt Discount (Premium)	$ 259,198	$ 381,828	$ 524,769	$ 825,695
Repayments of Long-term Debt, Total			10,000,000
Credit Agreement [Member]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total	204,444	$ 368,000	408,889	$ 776,889
Repayments of Long-term Debt, Total	$ 10,000,000		$ 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