Note 6 - Property and Equipment, Net (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Depreciation, Total $ 177,909 $ 189,522 $ 541,887 $ 576,128