Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations and Accounts Receivable (Details)

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Customer Concentrations and Accounts Receivable (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Sales | Customer concentrations | Warren CAT      
Customer Concentrations and Accounts Receivable      
Concentration percentage 18.00%    
Sales | Customer concentrations | Supernova      
Customer Concentrations and Accounts Receivable      
Concentration percentage 12.00%    
Sales | Customer concentrations | E-Finity      
Customer Concentrations and Accounts Receivable      
Concentration percentage 10.00% 15.00%  
Sales | Customer concentrations | Horizon Power Systems      
Customer Concentrations and Accounts Receivable      
Concentration percentage   21.00%  
Net accounts receivable | Credit concentration | Supernova      
Customer Concentrations and Accounts Receivable      
Concentration percentage 12.00%   10.00%
Net accounts receivable | Credit concentration | E-Finity      
Customer Concentrations and Accounts Receivable      
Concentration percentage 10.00%   18.00%
Net accounts receivable | Credit concentration | Serba      
Customer Concentrations and Accounts Receivable      
Concentration percentage 15.00%   20.00%
Net accounts receivable | Credit concentration | Reliable Secure Power Systems      
Customer Concentrations and Accounts Receivable      
Concentration percentage 10.00%