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Sale of Vehicle Sensors (Details)
3 Months Ended
Jul. 29, 2011
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Sale of Vehicle Sensors      
Cash proceeds from sale of business segment   $ 59,000  
Number of discontinued operations business segments | segment   1  
Gain on the sale, net of tax   $ 56,000 $ 52,000
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   1,700,000  
Cash proceeds from sale of business segment   15,400,000  
Gain on the sale, net of tax   $ 56,000 $ 52,000