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Segment Information (Schedule of Segment Interest Income and Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]      
Interest income $ 372 $ 535 $ 596
Interest expenses
Injection Molded Plastic Parts [Member]      
Segment Reporting Information [Line Items]      
Interest income 364 509 495
Interest expenses
Electronic Products [Member]      
Segment Reporting Information [Line Items]      
Interest income 8 26 101
Interest expenses
Metallic Parts [Member]      
Segment Reporting Information [Line Items]      
Interest income
Interest expenses