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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Revenue, Major Customer [Line Items]      
Net sales: $ 19,166 $ 19,603 $ 22,935
Operating income: 1,938 761 1,516
Depreciation and amortization expense: 319 266 317
Capital expenditure: 271 197 524
Total assets: 18,130 17,552  
Property, plant and equipment: 770 954  
Metal Stamping and Mechanical OEM [Member]      
Revenue, Major Customer [Line Items]      
Net sales: 9,638 8,323 10,268
Operating income: 955 267 738
Depreciation and amortization expense: 160 107 137
Capital expenditure: 136 88 226
Total assets: 8,402 7,374  
Property, plant and equipment: 391 412  
Electric OEM [Member]      
Revenue, Major Customer [Line Items]      
Net sales: 9,528 11,280 12,667
Operating income: 1,123 646 916
Depreciation and amortization expense: 159 159 180
Capital expenditure: 135 109 298
Total assets: 9,535 8,597  
Property, plant and equipment: 379 542  
Corporate [Member]      
Revenue, Major Customer [Line Items]      
Operating income: (140) (152) $ (138)
Total assets: $ 193 $ 1,581