Annual report pursuant to Section 13 and 15(d)

Product Warranties (Details Textual)

v3.20.1
Product Warranties (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Product Warranties (Textual) [Abstract]    
Current portions of warranty reserve $ 120 $ 74
Long-term portions of the warranty reserve $ 40 $ 56
CNS [Member] | Minimum [Member]    
Product Liability Contingency [Line Items]    
Standard Product Warranty Description P1Y  
CNS [Member] | Maximum [Member]    
Product Liability Contingency [Line Items]    
Standard Product Warranty Description P7Y  
ISM [Member]    
Product Liability Contingency [Line Items]    
Standard Product Warranty Description P1Y  
IBW [Member] | Minimum [Member]    
Product Liability Contingency [Line Items]    
Standard Product Warranty Description P1Y  
IBW [Member] | Maximum [Member]    
Product Liability Contingency [Line Items]    
Standard Product Warranty Description P5Y