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Segment Reporting Segment reporting (Details) - USD ($) $ 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
Segment Reporting Information [Line Items]
Net sales	$ 75,106	$ 77,149	$ 67,661	$ 62,021	$ 66,680	$ 68,539	$ 60,506	$ 57,240	$ 281,937	$ 252,965	$ 228,621
Depreciation and amortization									6,748	5,524	4,890
Net income (loss) before provision (benefit) for income taxes									48,668	32,096	31,846
Capital expenditures									9,262	6,176	5,366
Long-lived assets	46,412				41,986				46,412	41,986	41,606
Total assets	223,663				222,326				223,663	222,326	200,314
US segment [Member]
Segment Reporting Information [Line Items]
Net sales									258,942	232,116	213,702
Depreciation and amortization									6,115	4,900	4,318
Net income (loss) before provision (benefit) for income taxes									46,927	31,674	32,142
Capital expenditures									9,183	6,156	5,299
Long-lived assets	36,089				31,446				36,089	31,446	30,125
Total assets	222,252				222,613				222,252	222,613	200,260
Australia Segment [Member]
Segment Reporting Information [Line Items]
Net sales									22,995	20,849	14,919
Depreciation and amortization									633	624	572
Net income (loss) before provision (benefit) for income taxes									1,893	453	295
Capital expenditures									79	20	67
Long-lived assets	10,323				10,540				10,323	10,540	11,481
Total assets	19,099				17,130				19,099	17,130	17,982
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									281,937	252,965	228,621
Operating Segments [Member] | US segment [Member]
Segment Reporting Information [Line Items]
Net sales									267,552	239,689	219,142
Operating Segments [Member] | Australia Segment [Member]
Segment Reporting Information [Line Items]
Net sales									22,995	20,849	14,919
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									(8,610)	(7,573)	(5,440)
Net income (loss) before provision (benefit) for income taxes									(152)	(31)	(591)
Total assets	$ (17,688)				$ (17,417)				(17,688)	(17,417)	(17,928)
Intersegment Eliminations [Member] | US segment [Member]
Segment Reporting Information [Line Items]
Net sales									8,610	7,573	5,440
Intersegment Eliminations [Member] | Australia Segment [Member]
Segment Reporting Information [Line Items]
Net sales									$ 0	$ 0	$ 0

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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