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Fair Value Measurements (Details)
12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Jan. 09, 2019
USD ($)
Dec. 21, 2018
USD ($)
Forward Foreign Currency Exchange Contracts [Member]        
Other liabilities [Abstract]        
Net gain (loss) on forward foreign currency exchange contracts $ (972,000) $ 752,000    
Contingent Consideration [Member]        
Change in warrant liability measured at fair value recurring basis using significant unobservable inputs (Level 3) [Roll Forward]        
Beginning balance 0      
Newly issued 4,400,000      
Changes in revaluation of contingent consideration included in earnings 321,000      
Exercises/settlements 0      
Net transfers in (out) of Level 3 0      
Ending balance $ 4,721,000 0    
Two-year R&D Milestone Event [Member] | Risk Free Interest Rate [Member] | Minimum [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0230      
Two-year R&D Milestone Event [Member] | Risk Free Interest Rate [Member] | Maximum [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0241      
Two-year R&D Milestone Event [Member] | Counter Party Rate [Member] | Minimum [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0630      
Two-year R&D Milestone Event [Member] | Counter Party Rate [Member] | Maximum [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0641      
Two-year R&D Milestone Event [Member] | Probability [Member] | Minimum [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.9      
Two-year R&D Milestone Event [Member] | Probability [Member] | Maximum [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 1      
Gross Profit Earn-out Consideration [Member] | Risk Free Interest Rate [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0223      
Gross Profit Earn-out Consideration [Member] | Counter Party Rate [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0623      
Gross Profit Earn-out Consideration [Member] | Expected Volatility [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.2900      
Gross Profit Earn-out Consideration [Member] | Weighted Average Cost of Capital [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.1600      
Revenue Earn-out Consideration [Member] | Risk Free Interest Rate [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0258      
Revenue Earn-out Consideration [Member] | Counter Party Rate [Member]        
Fair Value Assumptions [Abstract]        
Assumptions for fair value of contingent consideration 0.0503      
Mechanical Power Conversion, LLC [Member]        
Contingent Consideration [Abstract]        
Fair value of contingent consideration obligations $ 3,560,000     $ 3,560,000
Mechanical Power Conversion, LLC [Member] | Two-year R&D Milestone Event [Member]        
Contingent Consideration [Abstract]        
Fair value of contingent consideration obligations $ 2,190,000      
Term of R&D event milestone 2 years      
Mechanical Power Conversion, LLC [Member] | Gross Profit Earn-out Consideration [Member]        
Contingent Consideration [Abstract]        
Fair value of contingent consideration obligations $ 1,660,000      
Term of gross profit earn-out arrangement 3 years      
Dixie Electric, Ltd [Member]        
Contingent Consideration [Abstract]        
Fair value of contingent consideration obligations     $ 840,000  
Dixie Electric, Ltd [Member] | Revenue Earn-out Consideration [Member]        
Contingent Consideration [Abstract]        
Fair value of contingent consideration obligations $ 871,000      
Term of revenue earn-out arrangement 2 years      
Recurring [Member]        
Short-Term Investments [Abstract]        
Mutual funds $ 3,273,000 2,828,000    
Prepaid Expense and Other Current Assets [Abstract]        
Forward foreign currency exchange contracts 207,000 1,179,000    
Accrued liabilities [Abstract]        
Short-term contingent consideration 2,816,000 0    
Other current liabilities [Abstract]        
Deferred compensation 3,273,000 2,828,000    
Other liabilities [Abstract]        
Long-term contingent consideration 1,905,000 0    
Recurring [Member] | Level 1 [Member]        
Short-Term Investments [Abstract]        
Mutual funds 3,273,000 2,828,000    
Prepaid Expense and Other Current Assets [Abstract]        
Forward foreign currency exchange contracts 0 0    
Accrued liabilities [Abstract]        
Short-term contingent consideration 0 0    
Other current liabilities [Abstract]        
Deferred compensation 3,273,000 2,828,000    
Other liabilities [Abstract]        
Long-term contingent consideration 0 0    
Recurring [Member] | Level 2 [Member]        
Short-Term Investments [Abstract]        
Mutual funds 0 0    
Prepaid Expense and Other Current Assets [Abstract]        
Forward foreign currency exchange contracts 207,000 1,179,000    
Accrued liabilities [Abstract]        
Short-term contingent consideration 0 0    
Other current liabilities [Abstract]        
Deferred compensation 0 0    
Other liabilities [Abstract]        
Long-term contingent consideration 0 0    
Recurring [Member] | Level 3 [Member]        
Short-Term Investments [Abstract]        
Mutual funds 0 0    
Prepaid Expense and Other Current Assets [Abstract]        
Forward foreign currency exchange contracts 0 0    
Accrued liabilities [Abstract]        
Short-term contingent consideration 2,816,000 0    
Other current liabilities [Abstract]        
Deferred compensation 0 0    
Other liabilities [Abstract]        
Long-term contingent consideration $ 1,905,000 $ 0