Quarterly report pursuant to Section 13 or 15(d)

Customer Concentrations and Accounts Receivable (Details)

v3.8.0.1
Customer Concentrations and Accounts Receivable (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Customer Concentrations and Accounts Receivable          
Provision for doubtful accounts receivable $ (9,000) $ (500,000) $ (22,000) $ (1,396,000)  
Accounts receivable     3,778,000 2,221,000  
Deferred revenue     (49,000) $ 153,000  
BPC Engineering          
Customer Concentrations and Accounts Receivable          
Provision for doubtful accounts receivable     8,100,000    
Accounts receivable     $ 1,700,000    
Sales | Customer concentrations | Regatta          
Customer Concentrations and Accounts Receivable          
Concentration percentage 11.00%     11.00%  
Sales | Customer concentrations | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage 11.00%   13.00%    
Sales | Customer concentrations | Horizon Power Systems          
Customer Concentrations and Accounts Receivable          
Concentration percentage     12.00%    
Sales | Customer concentrations | Reliable Secure Power Systems          
Customer Concentrations and Accounts Receivable          
Concentration percentage 12.00%        
Sales | Customer concentrations | Optimal Group Australia          
Customer Concentrations and Accounts Receivable          
Concentration percentage 11.00%   10.00%    
Sales | Customer concentrations | BPC Engineering          
Customer Concentrations and Accounts Receivable          
Concentration percentage   11.00%      
Sales | Customer concentrations | IBT Europe GmbH          
Customer Concentrations and Accounts Receivable          
Concentration percentage 10.00%        
Net accounts receivable | Credit concentration | Regatta          
Customer Concentrations and Accounts Receivable          
Concentration percentage     13.00%    
Net accounts receivable | Credit concentration | E-Finity          
Customer Concentrations and Accounts Receivable          
Concentration percentage     16.00%   29.00%
Net accounts receivable | Credit concentration | Reliable Secure Power Systems          
Customer Concentrations and Accounts Receivable          
Concentration percentage     16.00%   10.00%
Net accounts receivable | Credit concentration | DTC          
Customer Concentrations and Accounts Receivable          
Concentration percentage         12.00%
Net accounts receivable | Credit concentration | IBT Europe GmbH          
Customer Concentrations and Accounts Receivable          
Concentration percentage     11.00%