Nature of Business and Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Nature of Business and Summary of Significant Accounting Policies
Basic EPS	$ 3,572	$ 2,869	$ 6,805	$ 4,373
Weighted Average Shares, Basic EPS	18,478,000	18,603,000	18,478,000	18,665,000
Stock Options	60,000	46,000	59,000	48,000
Diluted EPS	$ 3,572	$ 2,869	$ 6,805	$ 4,373
Weighted Average Shares, Diluted EPS	18,538,000	18,649,000	18,537,000	18,713,000
Net Income Per Share, Basic	$ 0.19	$ 0.15	$ 0.37	$ 0.23
Net Income Per Share, Diluted	$ 0.19	$ 0.15	$ 0.37	$ 0.23