Stock Plans (Detail Textuals) - USD ($)	3 Months Ended		6 Months Ended		7 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Nov. 06, 2020	Aug. 31, 2019	May 31, 2019
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased	25,000	0	30,000	0
Aggregate cost of shares repurchased	$ 201,000	$ 0	$ 229,000	$ 0
Common Stock
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased	25,000		30,000
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	25,000		30,000
Aggregate cost of shares repurchased	$ 201,000		$ 229,000
Shares repurchased, average cost per share	$ 8.05		$ 7.70
Remaining aggregate amount available for repurchases of shares of common stock	$ 7,797,000		$ 7,797,000
New Stock Repurchase Program | Common Stock | Subsequent Event
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased					149,000
Aggregate cost of shares repurchased					$ 1,203,000
Shares repurchased, average cost per share					$ 8.05