Supplementary Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Supplementary Quarterly Financial Information [Abstract]
Net sales	$ 117,434	$ 120,750	$ 118,530	$ 112,050	$ 122,764	$ 125,401	$ 125,410	$ 126,531	$ 468,764	$ 500,106	$ 466,904
Gross margin	26,827	28,446	26,748	26,630	29,430	28,716	27,684	27,869	108,651	113,699	109,860
Litigation Settlement Reimbursements		1,175				2,030	250		1,175	2,280	250
Net income (1)	$ 6,021	$ 7,624	$ 5,389	$ 4,752	$ 6,164	$ 6,944	$ 5,366	$ 5,763	$ 23,786	$ 24,237	$ 22,299
Earnings per share: Basic	$ 0.77	$ 0.98	$ 0.69	$ 0.62	$ 0.80	$ 0.91	$ 0.71	$ 0.77	$ 3.06	$ 3.19	$ 3.00
Earnings per share: Diluted	$ 0.76	$ 0.97	$ 0.68	$ 0.61	$ 0.79	$ 0.89	$ 0.69	$ 0.75	$ 3.02	$ 3.12	$ 2.89