Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 27, 2015	Jun. 28, 2014	Jun. 29, 2013
Summary of quarterly operating results and share data
Net revenues	$ 30,564	$ 31,757	$ 33,255	$ 33,259	$ 32,739	$ 30,681	$ 32,040	$ 32,608	$ 128,835	$ 128,068	$ 129,255
Cost of revenues	16,360	17,054	18,427	19,179	19,188	18,175	19,820	19,800	71,021	76,983	81,388
Gross profit	14,204	14,703	14,828	14,080	13,551	12,506	12,220	12,808	57,814	51,085	47,867
Operating expenses:
Research and development	4,261	4,614	4,390	4,588	4,782	4,694	5,274	5,045	17,853	19,795	21,017
Selling, general and administrative	7,444	7,573	7,682	7,300	8,100	7,407	7,126	7,687	29,998	30,320	29,581
Total operating expenses	11,705	12,187	12,072	11,888	12,882	12,101	12,400	12,732	47,851	50,115	67,497
Income from operations	2,499	2,516	2,756	2,192	669	405	(180)	76	9,963	970	(19,630)
Interest and other income, net	695	548	1,935	1,274	456	802	1,047	486	4,452	2,792	4,043
Income before income tax expense	3,194	3,064	4,691	3,466	1,125	1,207	867	562	14,415	3,762	(15,606)
Income tax expense	7	635	1,113	1,010	291	(421)	(331)	231	2,765	(230)	6,223
Net income from consolidated companies	3,187	2,429	3,578	2,456	834	1,628	1,198	331	11,650	3,992	(21,829)
Equity in net income of unconsolidated affiliates	27	35	74	39	50	13	27	43	175	132	215
Net income	$ 3,214	$ 2,464	$ 3,652	$ 2,495	$ 884	$ 1,641	$ 1,225	$ 374	$ 11,825	$ 4,124	$ (21,614)
Basic income per share	$ 0.14	$ 0.11	$ 0.17	$ 0.11	$ 0.04	$ 0.07	$ 0.05	$ 0.02	$ 0.53	$ 0.18	$ (0.93)
Diluted income per share	$ 0.14	$ 0.11	$ 0.16	$ 0.11	$ 0.04	$ 0.07	$ 0.05	$ 0.02	$ 0.52	$ 0.18	$ (0.93)
Shares used in computing basic income per share	22,344	22,436	22,110	21,936	22,123	22,659	22,800	22,794	22,206	22,594	23,251
Shares used in computing diluted income per share	22,928	23,049	22,624	22,262	22,338	22,880	23,019	22,951	22,716	22,797	23,251
Dividends declared and paid per share	$ 0.06	$ 0.06