| Research and development expenses |
| | November 30, 2021 | | | November 30, 2020 | | Machinery and equipment expenditures | | $ | 2,599,758 | | | $ | 2,325,540 | | Employee compensation | | | 1,786,765 | | | | 1,214,434 | | External engineering | | | 1,585,512 | | | | 2,224,910 | | Plant and laboratory operating expenses | | | 665,893 | | | | 515,395 | | Other | | | 197,376 | | | | (5,996 | ) | | | $ | 6,835,304 | | | $ | 6,274,283 | |
| | November 30, 2021 | | | November 30, 2020 | | Machinery and equipment expenditures | | $ | 7,707,882 | | | $ | 2,325,540 | | Employee compensation | | | 5,365,581 | | | | 3,094,151 | | External engineering | | | 5,040,342 | | | | 3,241,959 | | Plant and laboratory operating expenses | | | 2,064,403 | | | | 1,385,892 | | Other | | | 579,729 | | | | 456,551 | | | | $ | 20,757,937 | | | $ | 10,504,093 | |
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