Stock Plans (Detail Textuals) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2019	May 31, 2019
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased	24,000	0	24,000	0
Aggregate cost of shares repurchased	$ 216,000	$ 0	$ 216,000	$ 0
New Stock Repurchase Program | Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,000,000	$ 8,000,000
Number of shares repurchased			24,000
Aggregate cost of shares repurchased			$ 200,000
Shares repurchased, average cost per share			$ 8.88