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Summary of Significant Accounting Policies, Deferred Compensation Plan (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Deferred Compensation Plan [Abstract]
Short-term investments redeemed for the payment of deferred compensation liabilities	$ 0	$ 0
Carrying value of plan assets	3,273,000	2,828,000
Deferred compensation obligation	3,273,000	2,828,000
Expense related to the deferred compensation plan	$ 113,000	$ 118,000	$ (14,000)

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- Definition

Amount of short-term investments redeemed during the reporting period.

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-Section 30
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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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-SubTopic 210
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