Stock Plans (Detail Textuals) - USD ($)	3 Months Ended		15 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jul. 31, 2020	Aug. 31, 2019	May 31, 2019
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased	5,000	0
Aggregate cost of shares repurchased	$ 28,000	$ 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	4,712
Aggregate cost of shares repurchased	$ 28,000
Shares repurchased, average cost per share	$ 5.82
New Stock Repurchase Program | Common Stock | Subsequent Event
Equity Class Of Treasury Stock [Line Items]
Number of shares repurchased			123,751
Aggregate cost of shares repurchased			$ 1,000,000
Shares repurchased, average cost per share			$ 8.05