Quarterly report pursuant to Section 13 or 15(d)

Product Warranties (Details Textual)

v3.10.0.1
Product Warranties (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Product Warranties (Textual) [Abstract]    
Current portions of warranty reserve $ 113 $ 125
Non-current portions of the warranty reserve $ 172 $ 175
IBW [Member] | Minimum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P1Y  
IBW [Member] | Maximum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P5Y  
ISM [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P1Y  
CNS [Member] | Minimum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P1Y  
CNS [Member] | Maximum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P7Y