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Segment Information (Details) - Schedule of geographical segment - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Revenue from contracts with customers:      
Total revenue from contracts with customers $ 9,168 $ 12,558 $ 14,277
Property, plant and equipment, net:      
Total property, plant and equipment, net 833 878  
Hong Kong and China [Member]      
Revenue from contracts with customers:      
Total revenue from contracts with customers 1,554 2,186 2,794
Property, plant and equipment, net:      
Total property, plant and equipment, net 98 127  
Europe [Member]      
Revenue from contracts with customers:      
Total revenue from contracts with customers 7,269 9,790 10,901
Other Asian countries [Member]      
Revenue from contracts with customers:      
Total revenue from contracts with customers 37 128
North America [Member]      
Revenue from contracts with customers:      
Total revenue from contracts with customers 308 582 $ 454
Myanmar [Member]      
Property, plant and equipment, net:      
Total property, plant and equipment, net $ 735 $ 751