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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]        
Net Sales $ 67,661 $ 60,506 $ 129,682 $ 117,746
Income before provision for income taxes 11,682 8,634 18,055 14,600
US [Member]        
Segment Reporting Information [Line Items]        
Net Sales 61,488 55,113 118,014 107,583
Income before provision for income taxes 11,215 8,670 17,276 14,459
Australia Segment [Member]        
Segment Reporting Information [Line Items]        
Net Sales 6,173 5,393 11,668 10,163
Income before provision for income taxes 455 59 839 117
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net Sales 67,661 60,506 129,682 117,746
Operating Segments [Member] | US [Member]        
Segment Reporting Information [Line Items]        
Net Sales 63,672 57,006 122,440 110,901
Operating Segments [Member] | Australia Segment [Member]        
Segment Reporting Information [Line Items]        
Net Sales 6,173 5,393 11,668 10,163
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Net Sales (2,184) (1,893) (4,426) (3,318)
Income before provision for income taxes 12 (95) (60) 24
Intersegment Eliminations [Member] | US [Member]        
Segment Reporting Information [Line Items]        
Net Sales $ 2,184 $ 1,893 $ 4,426 $ 3,318