Nature of Business and Summary of Significant Accounting Policies - Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]
Net Income, Basic (in dollars)									$ 5,599	$ 5,773	$ 4,845
Net Income, Diluted (in dollars)									$ 5,599	$ 5,773	$ 4,845
Weighted Average Shares, Basic EPS									18,809,000	18,874,000	19,164,000
Effect of Dilutive Securities Stock Options									45,000	20,000	5,000
Weighted average shares, Diluted EPS									18,854,000	18,894,000	19,169,000
Net Income Per Share, Basic	$ 0.17	$ 0.05	$ 0.05	$ 0.03	$ 0.18	$ 0.06	$ 0.05	$ 0.02	$ 0.3	$ 0.31	$ 0.25
Net Income Per Share, Diluted	$ 0.17	$ 0.05	$ 0.05	$ 0.03	$ 0.18	$ 0.06	$ 0.05	$ 0.02	$ 0.3	$ 0.31	$ 0.25