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Note 7 - Restricted Cash - Restricted Cash (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Jul. 31, 2020
Restricted cash, beginning of period   $ 1,839,216 $ 1,821,392
Additional surety bond collateral $ 198,377 198,377
Interest received   84 17,824
Restricted cash, end of period $ 2,037,677 $ 2,037,677 $ 1,839,216