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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Revenue, Major Customer [Line Items]      
Net sales: $ 19,603 $ 22,935 $ 22,373
Operating income: 761 1,516 1,271
Interest expense:
Depreciation and amortization expense: 266 317 393
Capital expenditure: 197 524 129
Total assets: 17,552 17,039  
Long-lived assets: 954 1,121  
Metal Stamping and Mechanical OEM [Member]      
Revenue, Major Customer [Line Items]      
Net sales: 8,323 10,268 12,520
Operating income: 267 738 745
Interest expense:
Depreciation and amortization expense: 107 137 226
Capital expenditure: 88 226 71
Total assets: 7,374 7,268  
Long-lived assets: 412 518  
Electric OEM [Member]      
Revenue, Major Customer [Line Items]      
Net sales: 11,280 12,667 9,853
Operating income: 646 916 605
Interest expense:
Depreciation and amortization expense: 159 180 167
Capital expenditure: 109 298 58
Total assets: 8,597 9,638  
Long-lived assets: 542 603  
Corporate [Member]      
Revenue, Major Customer [Line Items]      
Operating income: (152) (138) $ (79)
Total assets: $ 1,581 $ 133