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Acquisitions, Mechanical Power Conversion, LLC (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 21, 2018
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Purchase Price Allocation [Abstract]          
Goodwill   $ 3,205,000 $ 3,205,000 $ 2,551,000 $ 2,551,000
Developed Technology [Member]          
Business Acquisition [Abstract]          
Estimated useful life     5 years    
Customer Relationships [Member]          
Business Acquisition [Abstract]          
Estimated useful life     11 years    
Order Backlog [Member]          
Business Acquisition [Abstract]          
Estimated useful life     6 months    
Trademarks [Member]          
Business Acquisition [Abstract]          
Estimated useful life     9 years    
Mechanical Power Conversion, LLC [Member]          
Business Acquisition [Abstract]          
Aggregate contingent consideration obligation $ 5,200,000        
Acquisition costs   355,000 $ 355,000    
Consideration [Abstract]          
Cash consideration 4,417,000 4,417,000      
Working capital adjustment   42,000      
Contingent consideration 3,560,000 3,560,000 3,560,000    
Total 7,977,000 8,019,000      
Purchase Price Allocation [Abstract]          
Accounts receivable, net of allowances 985,000 1,293,000 1,293,000    
Inventory 1,683,000 1,624,000 1,624,000    
Prepaid expenses and other current assets 14,000 14,000 14,000    
Plant and equipment 97,000 97,000 97,000    
Accounts payable and accrued expenses (202,000) (202,000) (202,000)    
Customer deposits (1,111,000) (1,111,000) (1,111,000)    
Fair value of net assets acquired 7,126,000 7,365,000 7,365,000    
Goodwill 851,000 654,000 $ 654,000    
Subsequent Changes in Valuation Estimates, Consideration [Abstract]          
Cash consideration   0      
Working capital adjustment   42,000      
Contingent consideration   0      
Total subsequent changes in valuation estimates   42,000      
Subsequent Changes in Valuation Estimates, Purchase Price Allocation [Abstract]          
Accounts receivable, net of allowances   308,000      
Inventory   (59,000)      
Prepaid expenses and other current assets   0      
Property, Plant, and Equipment   0      
Accounts payable and accrued liabilities   0      
Customer deposits   0      
Fair value of net assets acquired   239,000      
Goodwill   (197,000)      
Mechanical Power Conversion, LLC [Member] | Minimum [Member]          
Business Acquisition [Abstract]          
Contingent consideration payment period     2 years    
Mechanical Power Conversion, LLC [Member] | Maximum [Member]          
Business Acquisition [Abstract]          
Contingent consideration payment period     3 years    
Mechanical Power Conversion, LLC [Member] | Developed Technology [Member]          
Business Acquisition [Abstract]          
Estimated useful life     5 years    
Purchase Price Allocation [Abstract]          
Finite-lived intangible assets acquired 2,660,000 2,660,000 $ 2,660,000    
Subsequent Changes in Valuation Estimates, Purchase Price Allocation [Abstract]          
Intangibles   0      
Mechanical Power Conversion, LLC [Member] | Customer Relationships [Member]          
Business Acquisition [Abstract]          
Estimated useful life     8 years    
Purchase Price Allocation [Abstract]          
Finite-lived intangible assets acquired 2,630,000 2,670,000 $ 2,670,000    
Subsequent Changes in Valuation Estimates, Purchase Price Allocation [Abstract]          
Intangibles   40,000      
Mechanical Power Conversion, LLC [Member] | Order Backlog [Member]          
Business Acquisition [Abstract]          
Estimated useful life     6 months    
Purchase Price Allocation [Abstract]          
Finite-lived intangible assets acquired $ 370,000 320,000 $ 320,000    
Subsequent Changes in Valuation Estimates, Purchase Price Allocation [Abstract]          
Intangibles   $ (50,000)