Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	[1]	$ 272	$ 479	$ 247
Additions charged to expenses	[1]	270	43	366
Deductions from reserves	[1],[2]	(17)	(250)	(134)
Balance at end of year	[1]	$ 525	$ 272	$ 479

[1] The allowance for doubtful accounts is presented on a consolidated basis.

[2] The deductions related to allowances for doubtful accounts represent net balance of accounts receivable which were written off and recovered.