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Note 9 - Long-term Debt - Long-term Debt Consisted of the Following: (Details) - USD ($)
Apr. 30, 2019
Dec. 05, 2018
Oct. 31, 2018
Jul. 31, 2018
Long-term Debt, Gross $ 20,000,000 $ 20,000,000   $ 20,000,000
Unamortized discount (814,355)     (465,026)
Long-term debt, net of unamortized discount 19,185,645     19,534,974
Long-term Debt, Current Maturities, Total   $ 15,000,000 10,000,000
Long-term debt, net of current portion $ 19,185,645     $ 9,534,974