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Organization and basis of financial statements - VIE (Details)
 12 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2023
CNY (¥)
Mar. 31, 2022
CNY (¥)
Variable interest entity          
Contract price exceeding the limit to be called for major contract $ 100,000        
VIE contribution as a percentage of consolidated revenues 91.00% 100.00%      
VIE contribution as a percentage of consolidated total assets 82.00% 86.00%      
VIE contribution as a percentage of consolidated total liabilities 92.00% 90.00%      
Current assets:          
Cash and cash equivalents $ 20,998,786 $ 23,834,125   ¥ 19,791,079 ¥ 21,206,372
Accounts receivable, net 458,104 252,215      
Total current assets 24,530,478 27,523,924      
Non-current assets          
Long-term investment 14,296,824 14,956,443      
Goodwill 4,306,579 4,581,112      
Property and equipment, net 81,315 10,699,010      
Intangible assets, net 254,646 15,332,396      
Total non-current assets 19,112,160 45,568,961      
TOTAL ASSETS 43,642,638 73,092,885      
Current liabilities:          
Accounts payable 21,894 77,266      
Taxes payable 258,383 127,645      
Deferred revenue-current 1,357,236 6,864,731      
Related party payables 54,588 46,649      
Deferred tax liabilities 1,357,236 6,864,731      
Total current liabilities 3,003,867 8,016,585      
Non-current liabilities:          
Deferred revenue-noncurrent 3,430 3,713      
Total non-current liabilities 13,684,529 14,813,015      
TOTAL LIABILITIES 16,688,396 22,829,600      
Revenue 11,323,744 23,050,619 $ 29,168,546    
Net income (loss) (20,906,985) (1,400,292) 3,498,005    
Net cash provided by operating activities (2,558,438) 4,828,933 10,754,484    
Net cash used in investing activities (300,631) (13,595,605) (20,864,698)    
Net cash provided by financing activities 1,000,000 14,809,302 13,243,554    
Effects of exchange rate changes on cash (976,270) 338,135 2,388,306    
Net cash inflow (2,835,339) 6,380,765 5,521,646    
VIEs          
Current assets:          
Cash and cash equivalents 19,142,721 20,651,502      
Accounts receivable, net 8,572 252,215      
Prepayments and other current assets 129,148 466,846      
Deferred expenses 939,252 1,101,761      
Amounts due from related parties 958,634 1,589,182      
Total current assets 21,178,327 24,061,506      
Non-current assets          
Long-term investment 14,296,824 14,673,898      
Goodwill   4,581,112      
Property and equipment, net 6,620 10,597,581      
Intangible assets, net   15,143,366      
Total non-current assets 14,303,444 44,995,957      
TOTAL ASSETS 35,481,771 69,057,463      
Current liabilities:          
Accounts payable 21,894 77,266      
Taxes payable 8,488 127,645      
Employee benefits payable 33,456 96,838      
Deferred revenue-current 1,357,236 6,864,731      
Other payables 104,738 5,104,380      
Interest payable 202,405        
Related party payables   44,107      
Deferred tax liabilities   38,744      
Total current liabilities 1,728,217 12,353,711      
Non-current liabilities:          
Long-term loans 13,681,099 14,809,302      
Deferred revenue-noncurrent   3,713      
Total non-current liabilities 13,681,099 14,813,015      
TOTAL LIABILITIES 15,409,316 27,166,726      
Revenue 10,250,708 23,050,619 29,168,546    
Net income (loss) (18,310,962) 1,750,836 8,436,207    
Net cash provided by operating activities 148,162 9,390,282 13,927,170    
Net cash used in investing activities (529,511) (18,530,989) (12,864,697)    
Net cash provided by financing activities   14,809,302      
Effects of exchange rate changes on cash (1,127,433) 266,364 1,722,356    
Net cash inflow (1,508,782) $ 5,934,959 $ 2,784,829    
VIEs | Asset not pledged as collateral          
Non-current assets          
TOTAL ASSETS $ 0