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Sale of Vehicle Sensors (Details)
3 Months Ended 6 Months Ended 74 Months Ended
Jul. 29, 2011
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sale of Vehicle Sensors            
Net proceeds from sale of discontinued operation       $ 260,000 $ 88,000  
Number of discontinued operations business segments | segment   1   1   1
Gain on the sale, net of tax   $ 77,000 $ 135,000 $ 163,000 191,000  
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           $ 2,400,000
Net proceeds from sale of discontinued operation           $ 17,700,000
Gain on the sale, net of tax       $ 163,000 $ 191,000