Annual report pursuant to Section 13 and 15(d)

Inventories Inventories - Valuation Reserve Accounts (Details)

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Inventories Inventories - Valuation Reserve Accounts (Details) - SEC Schedule, 12-09, Reserve, Inventory [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of period $ 2,045 $ 2,199 $ 2,077
Additions in reserve 133 172 166
Charged to reserve (404) (326) (44)
Balance, end of period $ 1,774 $ 2,045 $ 2,199