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Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Revenue, Major Customer [Line Items]      
Revenue from contracts with customers: $ 14,277 $ 19,166 $ 19,603
Operating income (loss): (755) 1,938 761
Depreciation expense: 261 319 266
Capital expenditure: 695 271 197
Total assets: 15,250 18,130  
Property, plant and equipment 886 770  
Metal Stamping and Mechanical OEM [Member]      
Revenue, Major Customer [Line Items]      
Revenue from contracts with customers: 7,717 9,638 8,323
Operating income (loss): (405) 955 267
Depreciation expense: 133 160 107
Capital expenditure: 398 136 88
Total assets: 8,084 8,402  
Property, plant and equipment 513 391  
Electric OEM [Member]      
Revenue, Major Customer [Line Items]      
Revenue from contracts with customers: 6,560 9,528 11,280
Operating income (loss): (250) 1,123 646
Depreciation expense: 128 159 159
Capital expenditure: 297 135 109
Total assets: 7,000 9,535  
Property, plant and equipment 373 379  
Corporate [Member]      
Revenue, Major Customer [Line Items]      
Operating income (loss): (100) (140) $ (152)
Total assets: $ 166 $ 193