Income Taxes - Reconciliation of Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Benefit Expenses [Line Items]
Tax at Federal statutory rate	$ 2,140	$ 2,089	$ 1,721
Increases (decreases) in taxes resulting from:
Meals and entertainment	68	61	66
State income taxes, net of Federal income tax benefit	28	20	21
Foreign source income not subject to tax	(1,286)	(1,278)	(1,069)
R&D Credit refund	(286)	(415)	(328)
Undistributed foreign earnings	0	(90)	(93)
Other, net	32	(16)	(102)
Effective tax rate	$ 696	$ 371	$ 216
Tax at Federal statutory rate	34.00%	34.00%	34.00%
Increases (decreases) in taxes resulting from:
Meals and entertainment	1.10%	1.00%	1.30%
State income taxes, net of Federal income tax benefit	0.40%	0.30%	0.40%
Foreign source income not subject to tax	(20.40%)	(20.80%)	(21.10%)
R&D Credit refund	(4.50%)	(6.80%)	(6.50%)
Undistributed foreign earnings	0.00%	(1.40%)	(1.80%)
Other, net	0.50%	(0.30%)	(2.00%)
Effective tax rate	11.10%	6.00%	4.30%