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Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 21, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Taxes (Textual)        
Tax losses   $ 2,723 $ 3,424  
Tax losses carried forward   99 242  
Other tax losses   $ 2,382 $ 3,083  
Operating loss carry forward expiration date   Expire during the year ending March 31, 2023 and 2025.    
Income tax, description The Hong Kong Legislative Council passed The Inland Revenue (Amendment) (No. 7) Bill 2017 (the "Bill") which introduces the two-tiered profits tax rates regime. The Bill was signed into law on March 28, 2018 and was gazetted on the following day. Under the two-tiered profits tax rates regime, the first HK$2 million (equivalent to $257) of profits of the qualifying group entity will be taxed at 8.25%, and profits above HK$2 million will be taxed at 16.5%. The profits of group entities not qualifying for the two-tiered profits tax rates regime will continue to be taxed at a flat rate of 16.5%. The Group has selected Kayser Limited ("Kayser") as the qualified entity under two-tiered profit tax rates regime and the remaining Hong Kong based subsidiaries are not qualifying under the regime and continue to be taxed at 16.5%.      
China [Member]        
Income Taxes (Textual)        
Effective income tax rate reconciliation, at federal statutory income tax rate   25.00%    
Income tax, description   However, Kayser Myanmar enjoyed a tax exemption for the period through the end of December 31, 2017 and was subject to an income tax rate of 25% starting from January 1, 2018 onward.    
Hong Kong [Member]        
Income Taxes (Textual)        
Effective income tax rate reconciliation, at federal statutory income tax rate   16.50% 16.50% 16.50%