v3.26.1
Income taxes (Details Narrative)
¥ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 14, 2022
Jun. 30, 2026
CNY (¥)
Mar. 31, 2026
HKD ($)
Mar. 30, 2026
CNY (¥)
Mar. 31, 2025
HKD ($)
Mar. 31, 2024
Mar. 31, 2026
USD ($)
Mar. 31, 2026
CNY (¥)
Mar. 31, 2025
USD ($)
Effective Income Tax Rate Reconciliation [Line Items]                  
Income tax exempt amount | $     $ 2   $ 2        
Interest rate             8.25% 8.25% 16.50%
Interest rate     (6.10%)   (5.60%) (10.60%)      
Taxable income       ¥ 1          
Assets | $             $ 32,279,821   $ 24,781,491
Effective interest rate 5.00%   10.00%            
Taxable income       ¥ 3          
Small And Micro Enterprises [Member]                  
Effective Income Tax Rate Reconciliation [Line Items]                  
Taxable income   ¥ 3              
Assets               ¥ 50  
Small Scale And Low Profit Enterprise [Member]                  
Effective Income Tax Rate Reconciliation [Line Items]                  
Interest rate             5.00% 5.00%  
Small Scale And Low Profit Enterprises [Member]                  
Effective Income Tax Rate Reconciliation [Line Items]                  
Taxable income   ¥ 1              
Small And Low Profit Enterprises [Member]                  
Effective Income Tax Rate Reconciliation [Line Items]                  
Effective interest rate     5.00%   5.00% 5.00%      
Income Tax Jurisdiction, Domestic Federal, State, and Local [Member]                  
Effective Income Tax Rate Reconciliation [Line Items]                  
Interest rate     25.00%