CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Jan. 01, 2022	Oct. 02, 2021	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022
Income Statement [Abstract]
Net sales	$ 126,556	$ 142,427	$ 147,847	$ 150,112	$ 168,994	$ 167,758	$ 127,592	$ 140,971	$ 133,926	$ 140,714	$ 136,407	$ 133,130	$ 566,942	$ 605,315	$ 544,177
Cost of sales	117,383	134,346	136,084	139,250	155,096	153,482	118,672	130,592	122,166	129,206	126,599	122,992	527,063	557,843	500,963
Gross profit	9,173	8,081	11,763	10,862	13,898	14,276	8,920	10,379	11,760	11,508	9,808	10,138	39,879	47,472	43,214
Research, development and engineering expenses	2,100	2,234	1,758	2,241	2,573	2,580	2,287	2,296	2,348	2,526	2,498	2,449	8,333	9,735	9,821
Selling, general and administrative expenses	6,956	6,422	6,057	5,784	7,363	6,961	5,735	5,656	7,151	6,193	5,659	5,595	25,219	25,715	24,598
Gain on insurance proceeds, net of losses	0	0	0	(431)	(261)	(396)	(2,710)	(934)	0	0	0	0	(431)	(4,301)	0
Total operating expenses	9,056	8,656	7,815	7,594	9,675	9,145	5,312	7,018	9,499	8,719	8,157	8,044	33,121	31,149	34,419
Operating income	117	(575)	3,948	3,268	4,223	5,131	3,608	3,361	2,261	2,789	1,651	2,094	6,758	16,323	8,795
Interest expense, net	3,173	2,800	2,961	3,011	2,941	2,688	2,507	1,887	1,466	1,551	1,095	992	11,945	10,023	5,104
Income before income taxes	(3,056)	(3,375)	987	257	1,282	2,443	1,101	1,474	795	1,238	556	1,102	(5,187)	6,300	3,691
Income tax provision (benefit)	(1,071)	(1,154)	(97)	(78)	220	467	134	322	(173)	231	(31)	287	(2,400)	1,143	314
Net income (loss)	$ (1,985)	$ (2,221)	$ 1,084	$ 335	$ 1,062	$ 1,976	$ 967	$ 1,152	$ 968	$ 1,007	$ 587	$ 815	$ (2,787)	$ 5,157	$ 3,377
Net income (loss) per share — Basic (in dollars per share)	$ (0.18)	$ (0.21)	$ 0.10	$ 0.03	$ 0.10	$ 0.18	$ 0.09	$ 0.11	$ 0.09	$ 0.09	$ 0.05	$ 0.08	$ (0.26)	$ 0.48	$ 0.31
Weighted average shares outstanding — Basic (in shares)	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762	10,762
Net income (loss) per share — Diluted (in dollars per share)	$ (0.18)	$ (0.21)	$ 0.10	$ 0.03	$ 0.10	$ 0.18	$ 0.09	$ 0.11	$ 0.09	$ 0.09	$ 0.05	$ 0.07	$ (0.26)	$ 0.47	$ 0.31
Weighted average shares outstanding — Diluted (in shares)	10,762	10,762	10,889	11,003	10,996	10,865	10,832	10,832	11,071	11,062	11,057	11,052	10,762	10,938	11,063