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, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2018	Jun. 30, 2017
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]
Basic EPS																	$ 7,649	$ 5,599
Weighted Average Shares, Basic EPS																	18,788,000	18,809,000
Stock Options																	37,000	45,000
Diluted EPS																	$ 7,649	$ 5,599
Weighted Average Shares, Diluted EPS																	18,825,000	18,854,000
Net Income Per Share, Basic	$ 0.20		$ 0.10		$ 0.07		$ 0.05		$ 0.17		$ 0.05		$ 0.05		$ 0.03		$ 0.41	$ 0.30
Net Income Per Share, Diluted	$ 0.20		$ 0.10		$ 0.07		$ 0.05		$ 0.17		$ 0.05		$ 0.05		$ 0.03		$ 0.41	$ 0.30

[1] Certain prior period balances have been reclassified to conform with the current period presentation.