Quarterly report pursuant to Section 13 or 15(d)

Product Warranties (Details Textual)

v3.20.4
Product Warranties (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Product Warranties (Textual) [Abstract]    
Current portions of warranty reserve $ 88 $ 120
Non-current portions of the warranty reserve $ 42 $ 40
IBW [Member] | Minimum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description one  
IBW [Member] | Maximum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description five  
ISM [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description one  
CNS [Member] | Minimum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description one  
CNS [Member] | Maximum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description seven years