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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Summary of Significant Accounting Policies (Details) [Line Items]          
Provision for credit loss $ 51    
Fixed interest rate 8.00%        
Carrying amount         $ 77
VAT and surcharges $ 133 121 90    
Contract liabilities $ 79 72      
Contribution decription Contributions are made by the Group to a cap of HK$1,500 (equivalent to $0.19 per month).        
Employee benefit expenses $ 102 75 124    
Income tax, description The Group recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized.        
Mandatory Provident Fund [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Employee benefit expenses $ 95 88 99    
Kayser Myanmar [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Employee benefit expenses $ 4 $ 6 $ 8    
Kayser Myanmar [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Impairment losses       $ 77  
Machinery and Equipment [Member] | Minimum [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Estimated useful lives 5 years        
Machinery and Equipment [Member] | Maximum [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Estimated useful lives 10 years        
Leasehold Improvements [Member] | Minimum [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Estimated useful lives 2 years        
Leasehold Improvements [Member] | Maximum [Member]          
Summary of Significant Accounting Policies (Details) [Line Items]          
Estimated useful lives 5 years