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Sale of Vehicle Sensors (Details)
12 Months Ended 68 Months Ended
Jul. 29, 2011
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2017
USD ($)
segment
Sale of Vehicle Sensors          
Net proceeds from sale of discontinued operation   $ 495,000 $ 368,000 $ 142,000  
Number of discontinued operations business segments | segment   1     1
Gain on the sale, net of tax   $ 361,000 214,000 207,000  
Vehicle Sensors segment          
Sale of Vehicle Sensors          
Additional cash consideration, percentage of revenue associated with royalties 85.00%        
Amount of earn-outs in connection with royalty         $ 2,100,000
Net proceeds from sale of discontinued operation         $ 17,400,000
Gain on the sale, net of tax   $ 361,000 $ 214,000 $ 207,000