Stock Plans (Detail Textuals) - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Aug. 31, 2019	May 31, 2019
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased	60,000	5,000
Aggregate cost of shares repurchased	$ 665,000	$ 28,000
New Stock Repurchase Program | Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount			$ 1,000,000.0	$ 8,000,000.0
Number of shares repurchased	60,388
Aggregate cost of shares repurchased	$ 665,000
Shares repurchased, average cost per share	$ 11.00