Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Total Allowance for Doubtful Accounts
Balance at Beginning of Year		$ 954	$ 586	$ 416
Additions Charged to Expenses		250	941	509
Deductions	[1]	(300)	(573)	(339)
Balance At End of Year		$ 904	$ 954	$ 586

[1] The deductions related to allowance for doubtful accounts represent accounts receivable which are written off.