Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Stock Subscriptions Receivable [Member]	Total
Balance (in shares) at Dec. 28, 2019	15,826,891				2,823,172
Balance at Dec. 28, 2019	$ 791	$ 108,452	$ (2,748)	$ (59,105)	$ (14,987)		$ 32,403
Issuance of stock under employee stock purchase plan (in shares)	57,251				0
Issuance of stock under employee stock purchase plan	$ 3	137	0	0	$ 0		140
Share-based compensation expense	$ 0	69	0	0	$ 0		69
Issuance of stock upon vesting of restricted share awards (in shares)	60,000				0
Issuance of stock upon vesting of restricted share awards	$ 3	(3)	0	0	$ 0		0
Foreign currency translation adjustment	0	0	(131)	0	0		(131)
Net income (loss)	$ 0	0	0	(5,945)	$ 0		(5,945)
Issuance of stock under employee stock purchase plan (in shares)	57,251				0
Issuance of equity awards (in shares)	60,000				0
Balance (in shares) at Mar. 28, 2020	15,944,142				2,823,172
Balance at Mar. 28, 2020	$ 797	108,655	(2,879)	(65,050)	$ (14,987)		26,536
Balance (in shares) at Dec. 28, 2019	15,826,891				2,823,172
Balance at Dec. 28, 2019	$ 791	108,452	(2,748)	(59,105)	$ (14,987)		$ 32,403
Purchase of treasury stock (in shares)							1,858,139
Foreign currency translation adjustment							$ 44
Net income (loss)							(7,181)
Balance (in shares) at Sep. 26, 2020	16,144,966				4,681,311
Balance at Sep. 26, 2020	$ 807	109,027	(2,704)	(66,286)	$ (17,217)		23,627
Balance (in shares) at Mar. 28, 2020	15,944,142				2,823,172
Balance at Mar. 28, 2020	$ 797	108,655	(2,879)	(65,050)	$ (14,987)		26,536
Share-based compensation expense	$ 0	167	0	0	$ 0		167
Issuance of stock upon vesting of restricted share awards (in shares)	66,552				0
Issuance of stock upon vesting of restricted share awards	$ 3	(3)	0	0	$ 0		0
Purchase of treasury stock (in shares)	0				1,858,139
Purchase of treasury stock	$ 0	0	0	0	$ (2,230)		(2,230)
Foreign currency translation adjustment	0	0	57	0	0		57
Net income (loss)	$ 0	0	0	(992)	$ 0		(992)
Issuance of equity awards (in shares)	66,552				0
Balance (in shares) at Jun. 27, 2020	16,010,694				4,681,311
Balance at Jun. 27, 2020	$ 800	108,819	(2,822)	(66,042)	$ (17,217)		23,538
Issuance of stock under employee stock purchase plan (in shares)	60,732				0
Issuance of stock under employee stock purchase plan	$ 3	65	0	0	$ 0		68
Share-based compensation expense	$ 0	147	0	0	$ 0		147
Issuance of stock upon vesting of restricted share awards (in shares)	73,540				0
Issuance of stock upon vesting of restricted share awards	$ 4	(4)	0	0	$ 0		0
Foreign currency translation adjustment	0	0	118	0	0		118
Net income (loss)	$ 0	0	0	(244)	$ 0		(244)
Issuance of stock under employee stock purchase plan (in shares)	60,732				0
Issuance of equity awards (in shares)	73,540				0
Balance (in shares) at Sep. 26, 2020	16,144,966				4,681,311
Balance at Sep. 26, 2020	$ 807	109,027	(2,704)	(66,286)	$ (17,217)		23,627
Balance (in shares) at Jan. 02, 2021	16,224,191				4,681,311
Balance at Jan. 02, 2021	$ 811	109,588	(2,550)	(67,974)	$ (17,217)	$ (420)	22,238
Issuance of stock under employee stock purchase plan (in shares)	53,906				0
Issuance of stock under employee stock purchase plan	$ 3	58	0	0	$ 0	0	61
Stock subscription receivable (in shares)	57,696				0
Stock subscription receivable	$ 3	(3)	0	0	$ 0	97	97
Share-based compensation expense	$ 0	545	0	0	$ 0	0	545
Issuance of stock upon vesting of restricted share awards (in shares)	175,000				0
Issuance of stock upon vesting of restricted share awards	$ 9	(9)	0	0	$ 0	0	0
Purchase of treasury stock (in shares)	0				344,172
Purchase of treasury stock	$ 0	0	0	0	$ (911)	0	(911)
Foreign currency translation adjustment	0	0	(111)	0	0	0	(111)
Net income (loss)	$ 0	0	0	1,007	$ 0	0	1,007
Issuance of stock under employee stock purchase plan (in shares)	53,906				0
Issuance of equity awards (in shares)	175,000				0
Balance (in shares) at Apr. 03, 2021	16,510,793				5,025,483
Balance at Apr. 03, 2021	$ 826	110,179	(2,661)	(66,967)	$ (18,128)	(323)	22,926
Balance (in shares) at Jan. 02, 2021	16,224,191				4,681,311
Balance at Jan. 02, 2021	$ 811	109,588	(2,550)	(67,974)	$ (17,217)	(420)	$ 22,238
Purchase of treasury stock (in shares)							1,157,719
Foreign currency translation adjustment							$ (77)
Net income (loss)							5,015
Balance (in shares) at Oct. 02, 2021	16,695,480				5,839,030
Balance at Oct. 02, 2021	$ 834	110,781	(2,627)	(62,959)	$ (21,364)	(113)	24,552
Balance (in shares) at Apr. 03, 2021	16,510,793				5,025,483
Balance at Apr. 03, 2021	$ 826	110,179	(2,661)	(66,967)	$ (18,128)	(323)	22,926
Stock subscription receivable (in shares)	67,312				0
Stock subscription receivable	$ 3	(3)	0	0	$ 0	113	113
Share-based compensation expense	$ 0	235	0	0	$ 0	0	235
Issuance of stock upon vesting of restricted share awards (in shares)	7,500				0
Issuance of stock upon vesting of restricted share awards	$ 0	0	0	0	$ 0	0	0
Purchase of treasury stock (in shares)	0				497,883
Purchase of treasury stock	$ 0	0	0	0	$ (1,733)	0	(1,733)
Foreign currency translation adjustment	0	0	68	0	0	0	68
Net income (loss)	$ 0	0	0	1,256	$ 0	0	1,256
Issuance of equity awards (in shares)	7,500				0
Balance (in shares) at Jul. 03, 2021	16,585,605				5,523,366
Balance at Jul. 03, 2021	$ 829	110,411	(2,593)	(65,711)	$ (19,861)	(210)	22,865
Issuance of stock under employee stock purchase plan (in shares)	47,878				0
Issuance of stock under employee stock purchase plan	$ 2	73	0	0	$ 0	0	75
Stock subscription receivable (in shares)	57,696				0
Stock subscription receivable	$ 3	(3)	0	0	$ 0	97	97
Share-based compensation expense	$ 0	300	0	0	$ 0	0	300
Issuance of stock upon vesting of restricted share awards (in shares)	4,301				0
Issuance of stock upon vesting of restricted share awards	$ 0	0	0	0	$ 0	0	0
Purchase of treasury stock (in shares)	0				315,664
Purchase of treasury stock	$ 0	0	0	0	$ (1,503)	0	(1,503)
Foreign currency translation adjustment	0	0	(34)	0	0	0	(34)
Net income (loss)	$ 0	0	0	2,752	$ 0	0	2,752
Issuance of stock under employee stock purchase plan (in shares)	47,878				0
Issuance of equity awards (in shares)	4,301				0
Balance (in shares) at Oct. 02, 2021	16,695,480				5,839,030
Balance at Oct. 02, 2021	$ 834	$ 110,781	$ (2,627)	$ (62,959)	$ (21,364)	$ (113)	$ 24,552