Effects of New Accounting Pronouncements Effects of New Accounting Pronouncements (Details) - USD ($)	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
Cash and Cash Equivalents, at Carrying Value			$ 58,079,000			$ 63,021,000
Restricted Cash and Investments, Current	$ 294,000	$ 294,000	0
Restricted Cash, Noncurrent	250,000	250,000	250,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	65,142,000	65,142,000	58,329,000			$ 63,565,000	$ 78,428,000
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted	463,000	1,251,000
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0	$ 888,000	$ 888,000		$ 0