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Cost of revenue (Details) - USD ($)
12 Months Ended 53 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2023
Cost of revenue        
Amortization expenses $ 5,800,442 $ 7,751,161 $ 6,651,329  
Depreciation expenses of server hardware 3,943,495 4,172,837 3,689,815  
Website maintenance fee 1,510,417 2,746,431 1,565,281  
Resource usage fees 1,510,417 1,622,891 1,407,768  
Virtual simulation fee 555,560 1,106,713 1,279,050  
Maintenance material consumption fees 1,918 15,458 39,425  
Employee compensation 146,602 160,338    
Employee benefit expenses 10,281 9,199    
Impairment 13,800,583      
Other 21,175 88,171 79,743  
Total 27,300,890 $ 17,673,199 $ 14,712,411  
Institutions usage of resource validity period       5 years
Impairment to intangible asset $ 8,051,199