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Stock Plans (Detail Textuals) - USD ($)	3 Months Ended		9 Months Ended		10 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Feb. 08, 2021	Aug. 31, 2019	May 31, 2019
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased	64,000	24,000	94,000	24,000
Aggregate cost of shares repurchased	$ 519,000	$ 216,000	$ 748,000	$ 216,000
New Stock Repurchase Program | Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 9,000,000		$ 9,000,000			$ 1,000,000	$ 8,000,000
Number of shares repurchased	64,000		94,000
Aggregate cost of shares repurchased	$ 519,000		$ 748,000
Shares repurchased, average cost per share	$ 8.04		$ 7.96
Remaining aggregate amount available for repurchases of shares of common stock	$ 7,137,000		$ 7,137,000
New Stock Repurchase Program | Common Stock | Subsequent Event
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased					17,000
Aggregate cost of shares repurchased					$ 100,000
Shares repurchased, average cost per share					$ 8.56

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