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Acquisitions and Related Goodwill Acquisition and Related Goodwill (Details) - USD ($)
 6 Months Ended
Sep. 25, 2017
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Consideration        
Equity (884,890 shares of common stock at $4.02 per share)   $ 3,557,000 $ 0  
Recognized amounts of identifiable assets acquired and liabilities assumed        
Goodwill allocated   $ 1,711,000   $ 0
Infinia Technology Corporation (ITC)        
Consideration        
Cash $ 100,000      
Equity (884,890 shares of common stock at $4.02 per share) 3,600,000      
Contingent consideration 600,000      
Total Consideration 4,300,000      
Recognized amounts of identifiable assets acquired and liabilities assumed        
Core technology and know-how 3,400,000      
Working capital 200,000      
Property, plant and equipment (less than) 0      
Total identifiable net assets 3,600,000      
Long-term deferred tax liability 1,100,000      
Goodwill allocated $ 1,700,000