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Note 9 - Long-term Debt - Long-term Debt (Details) - USD ($)
Jul. 31, 2021
Jul. 31, 2020
Current portion $ 10,075,231
Long-term debt, net of current portion 19,869,477
Credit Agreement [Member]    
Long-term Debt, Gross 10,000,000 20,000,000
Unamortized discount and accrued fees 75,231 (130,523)
Long-term debt, net of unamortized discount 10,075,231 19,869,477
Current portion 10,075,231
Long-term debt, net of current portion $ 19,869,477