Stock Based Compensation (Schedule of Changes in Non-Vested Stock Options) (Details)	3 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Shares Subject to Option
Non-vested at July 1, 2021 | shares	103,450
Granted | shares	68,350
Vested | shares
Forfeited or expired | shares	(5,800)
Non-vested at September 30, 2021 | shares	166,000
Weighted Average Grant Date Fair Value (per Option)
Non-vested at July 1, 2021 | $ / shares	$ 2.22
Granted | $ / shares	3.73
Vested | $ / shares
Forfeited or expired | $ / shares	2.36
Non-vested at September 30, 2021 | $ / shares	$ 2.84