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8. LEASES - Operating leases (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2023
Jun. 29, 2023
Mar. 31, 2023
Leases      
Operating lease, option to extend true    
Operating lease, renewal term 5 years 3 years  
Operating lease, discount rate   3.90%  
Operating lease right-of-use assets $ 1,031   $ 684
Lease liabilities, current 396   413
Lease liabilities, non-current 592   238
Total operating lease liabilities $ 988   $ 651
Minimum      
Leases      
Operating lease, term of lease 5 months    
Maximum      
Leases      
Operating lease, term of lease 43 months