Summary of Significant Accounting Policies - Computation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 4,907	$ 1,724	$ 3,812	$ 2,451	$ 3,824	$ 1,661	$ 4,303	$ 1,761	$ 12,894	$ 11,549	$ 7,429
Denominator:
Basic weighted-average common shares outstanding (in shares)									14,070	14,105	14,055
Effect of dilutive securities:
Stock awards and options (in shares)									198	494	925
Diluted weighted-average common shares outstanding (in shares)									14,268	14,599	14,980
Income per share, basic (dollars per share)	$ 0.36	$ 0.12	$ 0.27	$ 0.17	$ 0.27	$ 0.12	$ 0.31	$ 0.13	$ 0.92	$ 0.82	$ 0.53
Income per share, diluted (dollars per share)	$ 0.35	$ 0.12	$ 0.26	$ 0.17	$ 0.26	$ 0.11	$ 0.30	$ 0.12	$ 0.90	$ 0.79	$ 0.50