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) - Inventory Valuation Reserve [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of period $ 1,329 $ 1,287 $ 1,116
Additions in reserve 721 348 383
Charged to reserve 27 (306) (212)
Balance, end of period $ 2,077 $ 1,329 $ 1,287