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, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Nature of Business and Summary of Significant Accounting Policies
Basic EPS	$ 3,197	$ 3,572	$ 5,516	$ 6,805
Weighted Average Shares, Basic EPS	18,347,000	18,478,000	18,347,000	18,478,000
Stock Options	55,000	60,000	50,000	59,000
Diluted EPS	$ 3,197	$ 3,572	$ 5,516	$ 6,805
Weighted Average Shares, Diluted EPS	18,402,000	18,538,000	18,397,000	18,537,000
Net Income Per Share, Basic	$ 0.17	$ 0.19	$ 0.30	$ 0.37
Net Income Per Share, Diluted	$ 0.17	$ 0.19	$ 0.30	$ 0.37