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Note 6 - Restricted Cash (Tables) | 12 Months Ended
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Jul. 31, 2021
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | July 31, 2021 |  |  | July 31, 2020 |
Restricted cash, beginning of period |  | $ | 1,839,216 |  |  | $ | 1,821,392 |
Additional surety bond collateral |  |  | 198,377 |  |  |  | - |
Interest received |  |  | 84 |  |  |  | 17,824 |
Restricted cash, end of period |  | $ | 2,037,677 |  |  | $ | 1,839,216 |
Schedule of Cash and Cash Equivalents and Restricted Cash [Table Text Block] |
|  | July 31, 2021 |  |  | July 31, 2020 |
Cash and cash equivalents |  | $ | 44,312,780 |  |  | $ | 5,147,703 |
Restricted cash |  |  | 2,037,677 |  |  |  | 1,839,216 |
Total cash, cash equivalents and restricted cash |  | $ | 46,350,457 |  |  | $ | 6,986,919 |

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