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Condensed financial information of the Company - Condensed cash flow (Details) - USD ($)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Condensed statements of income      
Net cash used in operating activities $ (2,558,438) $ 4,828,933 $ 10,754,484
Net cash generated from (used in) investing activities (300,631) (13,595,605) (20,864,698)
Net cash generated from financing activities 1,000,000 14,809,302 13,243,554
Net cash inflow(outflow) (2,835,339) 6,380,765 5,521,646
Parent company | Reportable legal entities      
Condensed statements of income      
Net cash used in operating activities (1,779,420) (3,157,114) (2,506,846)
Net cash generated from (used in) investing activities (645,000) 3,043,030 (8,000,000)
Net cash generated from financing activities 1,000,000   13,243,554
Net cash inflow(outflow) $ (1,424,420) $ (114,084) $ 2,736,708