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
Equity compensation expense from awards issued	$ 0	69	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)			(5,945)
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)							0
Foreign currency translation adjustment							$ (74)
Net income (loss)							(6,937)
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
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
Equity compensation expense from awards issued	$ 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
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
Equity compensation expense from awards issued	$ 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 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)							842,055
Foreign currency translation adjustment							$ (43)
Net income (loss)							2,263
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
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
Equity compensation expense from awards issued	$ 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