Nature of Business and Summary of Significant Accounting Policies - Net Income per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Nature of Business and Summary of Significant Accounting Policies
Basic EPS	$ 7,752	$ 2,319
Diluted EPS	$ 7,752	$ 2,319
Weighted average
Basic (in shares)	18,350,000	18,347,000
Stock Options	72,000	45,000
Diluted (in shares)	18,422,000	18,392,000
Effect of Dilutive Securities:
Basic (in dollars per share)	$ 0.42	$ 0.13
Diluted (in dollars per share)	$ 0.42	$ 0.13
Excluded from diluted EPS	0	40,000