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SEGMENT INFORMATION (DETAILS) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Revenue, Major Customer [Line Items]      
Intersegment sales $ 22,373 $ 22,936 $ 21,933
Intersegment eliminations 0 0 0
Total net sales 22,373 22,936 21,933
Operating income: 1,271 793 355
Interest expense: 0 1 9
Depreciation and amortization expense: 393 557 586
Capital expenditure: 129 73 319
Total assets: 16,987 15,776  
Long-lived assets: 1,094 1,213  
Metal Stamping and Mechanical OEM [Member]      
Revenue, Major Customer [Line Items]      
Unaffiliated customers 12,520 13,820 14,646
Intersegment sales 0 0 0
Total net sales 12,520 13,820 14,646
Operating income: 745 527 319
Interest expense: 0 1 6
Depreciation and amortization expense: 226 306 353
Capital expenditure: 71 44 210
Total assets: 9,123 10,452  
Long-lived assets: 609 796  
Electric OEM [Member]      
Revenue, Major Customer [Line Items]      
Unaffiliated customers 9,853 9,116 7,287
Intersegment sales 0 0 0
Total net sales 9,853 9,116 7,287
Operating income: 605 352 142
Interest expense: 0 0 3
Depreciation and amortization expense: 167 251 233
Capital expenditure: 58 29 109
Total assets: 7,732 4,859  
Long-lived assets: 485 417  
Corporate [Member]      
Revenue, Major Customer [Line Items]      
Operating income: (79) (86) $ (106)
Total assets: $ 132 $ 465