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New Accounting Pronouncements (Details) - USD ($)	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
New Accounting Pronouncements Recently Adopted [Abstract]
Gain on short-term investments	$ 111,000	$ 180,000	$ 0
Retained Earnings [Member]
New Accounting Pronouncements Recently Adopted [Abstract]
Cumulative-effect adjustment				$ 746,000

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- References

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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