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Sale of Vehicle Sensors (Details)
3 Months Ended 9 Months Ended
Jul. 29, 2011
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Sale of Vehicle Sensors          
Cash proceeds from sale of assets       $ 284,000 $ 99,000
Number of discontinued operations business segments | segment   1   1  
Sale of Vehicle Sensors, additional disclosures          
Gain on the sale, net of tax   $ 57,000 $ 56,000 $ 163,000 151,000
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       1,500,000  
Cash proceeds from sale of assets       14,900,000  
Sale of Vehicle Sensors, additional disclosures          
Gain on the sale, net of tax   $ 57,000 $ 56,000 $ 163,000 $ 151,000