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Accounting Principles and Practices (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]      
Document Fiscal Year (linked throughout the document) - not tagged 2021    
Advertising Expense $ 999 $ 1,648 $ 2,452
Movement in Standard Product Warranty Accrual [Roll Forward]      
Balance at beginning of year 3,581 3,634  
Accrual for warranties issued 2,319 2,723  
Warranties settled (2,778) (2,548)  
Balance at end of year $ 3,328 $ 3,581 $ 3,634