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Summary of Significant Accounting Policies, Deferred Compensation Plan (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Deferred Compensation Plan [Abstract]
Short-term investments redeemed for the payment of deferred compensation liabilities	$ 2,802,000	$ 0
Net realized and unrealized gains on investment sold and still held	96,000	89,000	$ 0
Realized gains recognized on investments sold	193,000
Unrealized losses recognized on investments held	(97,000)
Carrying value of plan assets	850,000	3,273,000
Deferred compensation obligation	850,000	3,273,000
Expense related to the deferred compensation plan	79,000	$ 113,000	$ 118,000
Executive Officer [Member]
Deferred Compensation Plan [Abstract]
Amount redeemed under deferred compensation plan	$ 1,432,000
Pay out period of deferred compensation	24 months
Deferred compensation, remaining unpaid amount	$ 1,295,000
Executive Officer [Member] | Accrued Liabilities [Member]
Deferred Compensation Plan [Abstract]
Deferred compensation, remaining unpaid amount	714,000
Executive Officer [Member] | Other Liabilities [Member]
Deferred Compensation Plan [Abstract]
Deferred compensation, remaining unpaid amount	$ 581,000

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