Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Balance at Beginning of Year	$ 27	$ 27	$ 49
Additions Charged to Costs and Expense
Additions Charged to Other Accounts
Deductions	14		22
Balance at End of Year	$ 13	$ 27	$ 27