Stock-Based Compensation (Details) - 2011 Phantom Stock Option and Long-term Incentive Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Stock option activity, shares [Roll Forward]
Number of options outstanding at beginning of year (in shares)	1,507,600	1,765,100
Options granted (in shares)	475,120	523,700
Options forfeited (in shares)	0	0
Number of options outstanding at period end (in shares)	1,982,720	2,288,800
Stock option related information [Abstract]
Cash paid out on options vested	$ 0	$ 0
Compensation expense recognized	810	$ 635
Total liability for the Plan	$ 5,800		$ 5,000