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Note 6 - Restricted Cash - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
Jul. 31, 2021
Jul. 31, 2020
Jul. 30, 2020
Jul. 31, 2019
Cash and cash equivalents $ 44,312,780 $ 5,147,703    
Restricted cash 2,037,677 1,839,216 $ 1,839,216 $ 1,821,392
Total cash, cash equivalents and restricted cash $ 46,350,457 $ 6,986,919