v3.26.1
Summary of significant accounting policies (Details Narrative)
12 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2026
CNY (¥)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2026
CNY (¥)
Aug. 29, 2025
USD ($)
Mar. 31, 2023
USD ($)
Cash, Uninsured Amount $ 3,320   $ 3,104        
Restricted Cash, Current 238,702        
Notes receivable $ 1,990,228            
Note receivable collected percentage 81.60% 81.60%          
Accounts and Financing Receivable, Allowance for Credit Loss     0        
Allowance for expected credit losses for accounts receivable $ 290,403   169,297 94,046     $ 3,887
Recognized allowance for expected credit losses on accounts receivable 109,078   76,146 91,020      
Allowance for expected credit losses advances to suppliers 17,030          
Recognized allowance for expected credit losses advances to suppliers 16,541        
Deferred offering costs           $ 2,120,858  
Impairments of long lived assets 0   0        
Damage or losses on transportation services 63,552   257,158 184,188      
Insurance indemnity 135,894   171,718 128,442      
Recognized contract assets 38,343   31,709        
[custom:GovernmentSubsidies] 124,794   16,642 27,202      
Government subsidy income 121,656 ¥ 864,000          
Employee contributions $ 302,131   290,113 $ 317,537      
VAT tax rate 9.00% 9.00%          
Rental income percentage 6.00% 6.00%          
Accumulated other comprehensive loss $ 226,287            
CHINA              
Cash, Uninsured Amount 1,588,970   832,398        
CHINA | Credit Risk [Member]              
Deposits 72,000       ¥ 500,000    
Cash, FDIC Insured Amount 1,588,970            
HONG KONG              
Cash, Uninsured Amount 1,462,580   $ 10,907        
HONG KONG | Credit Risk [Member]              
Deposits $ 102,000       ¥ 800,000