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SEGMENT INFORMATION (DETAILS) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Revenue, Major Customer [Line Items]      
Net sales: $ 22,935 $ 22,373 $ 22,936
Operating income: 1,516 1,271 793
Interest expense: 0 0 1
Depreciation and amortization expense: 317 393 557
Capital expenditure: 524 129 73
Total assets: 17,039 16,987  
Long-lived assets: 1,121 1,094  
Metal Stamping and Mechanical OEM [Member]      
Revenue, Major Customer [Line Items]      
Net sales: 10,268 12,520 13,820
Operating income: 738 745 527
Interest expense: 0 0 1
Depreciation and amortization expense: 137 226 306
Capital expenditure: 226 71 44
Total assets: 7,268 9,123  
Long-lived assets: 518 609  
Electric OEM [Member]      
Revenue, Major Customer [Line Items]      
Net sales: 12,667 9,853 9,116
Operating income: 916 605 352
Interest expense: 0 0 0
Depreciation and amortization expense: 180 167 251
Capital expenditure: 298 58 29
Total assets: 9,638 7,732  
Long-lived assets: 603 485  
Corporate [Member]      
Revenue, Major Customer [Line Items]      
Operating income: (138) (79) $ (86)
Total assets: $ 133 $ 132