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Acquisition (Details) - USD ($)
9 Months Ended
Dec. 21, 2018
Dec. 31, 2018
Dec. 31, 2017
Business Acquistion [Abstract]      
Goodwill acquired   $ 851,000 $ 0
Developed Technology [Member]      
Business Acquistion [Abstract]      
Estimated useful life   5 years  
Customer Relationships [Member]      
Business Acquistion [Abstract]      
Estimated useful life   11 years  
Order Backlog [Member]      
Business Acquistion [Abstract]      
Estimated useful life   6 months  
Mechanical Power Conversion, LLC [Member]      
Business Acquistion [Abstract]      
Cash purchase price $ 4,417,000    
Cash held in escrow account 360,000    
Aggregate contingent consideration obligation 5,200,000    
Preliminary fair value of contingent consideration obligations 3,560,000    
Inventory 1,683,000    
Other net liabilities 217,000    
Goodwill acquired $ 851,000    
Acquisition costs   $ 287,000  
Mechanical Power Conversion, LLC [Member] | Minimum [Member]      
Business Acquistion [Abstract]      
Contingent consideration payment period 2 years    
Mechanical Power Conversion, LLC [Member] | Maximum [Member]      
Business Acquistion [Abstract]      
Contingent consideration payment period 3 years    
Mechanical Power Conversion, LLC [Member] | Developed Technology [Member]      
Business Acquistion [Abstract]      
Finite-lived intangible assets acquired $ 2,660,000    
Estimated useful life   5 years  
Mechanical Power Conversion, LLC [Member] | Customer Relationships [Member]      
Business Acquistion [Abstract]      
Finite-lived intangible assets acquired 2,630,000    
Estimated useful life   8 years  
Mechanical Power Conversion, LLC [Member] | Order Backlog [Member]      
Business Acquistion [Abstract]      
Finite-lived intangible assets acquired $ 370,000    
Estimated useful life   6 months