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]	Total
Balance (in shares) at Dec. 29, 2018	15,578,345				2,823,172
Balance at Dec. 29, 2018	$ 778	$ 107,326	$ (2,755)	$ (63,163)	$ (14,987)	$ 27,199
Issuance of stock under employee stock purchase plan (in shares)	59,451
Issuance of stock under employee stock purchase plan	$ 3	162				165
Translation adjustment			11			11
Share-based compensation expense		241				241
Issuance of equity awards (in shares)	57,148
Issuance of equity awards	$ 3	(3)
Net (loss) income				1,463		1,463
Share-based compensation expense		241				241
Issuance of stock upon vesting of restricted stock units (in shares)	57,148
Issuance of stock upon vesting of restricted stock units	$ 3	(3)
Issuance of stock under employee stock purchase plan (in shares)	59,451
Balance (in shares) at Mar. 30, 2019	15,694,944				2,823,172
Balance at Mar. 30, 2019	$ 784	107,726	(2,744)	(61,700)	$ (14,987)	29,079
Balance (in shares) at Dec. 29, 2018	15,578,345				2,823,172
Balance at Dec. 29, 2018	$ 778	107,326	(2,755)	(63,163)	$ (14,987)	27,199
Translation adjustment						(2)
Net (loss) income						3,049
Balance (in shares) at Sep. 28, 2019	15,779,019				2,823,172
Balance at Sep. 28, 2019	$ 788	108,121	(2,757)	(60,114)	$ (14,987)	31,051
Balance (in shares) at Mar. 30, 2019	15,694,944				2,823,172
Balance at Mar. 30, 2019	$ 784	107,726	(2,744)	(61,700)	$ (14,987)	29,079
Translation adjustment			12			12
Share-based compensation expense		207				207
Issuance of equity awards (in shares)	25,000
Issuance of equity awards	$ 1	(1)
Net (loss) income				1,251		1,251
Share-based compensation expense		207				207
Issuance of stock upon vesting of restricted stock units (in shares)	25,000
Issuance of stock upon vesting of restricted stock units	$ 1	(1)
Balance (in shares) at Jun. 29, 2019	15,719,944				2,823,172
Balance at Jun. 29, 2019	$ 785	107,932	(2,732)	(60,449)	$ (14,987)	30,549
Issuance of stock under employee stock purchase plan (in shares)	59,075
Issuance of stock under employee stock purchase plan	$ 3	153				156
Translation adjustment			(25)			(25)
Share-based compensation expense		24				24
Net (loss) income				335		335
Share-based compensation expense		24				24
Issuance of stock under employee stock purchase plan (in shares)	59,075
Dividends forfeited		12				12
Balance (in shares) at Sep. 28, 2019	15,779,019				2,823,172
Balance at Sep. 28, 2019	$ 788	108,121	(2,757)	(60,114)	$ (14,987)	31,051
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
Issuance of stock under employee stock purchase plan	$ 3	137				140
Translation adjustment			(131)			(131)
Share-based compensation expense		69				69
Issuance of equity awards (in shares)	60,000
Issuance of equity awards	$ 3	(3)
Net (loss) income				(5,945)		(5,945)
Share-based compensation expense		69				69
Issuance of stock upon vesting of restricted stock units (in shares)	60,000
Issuance of stock upon vesting of restricted stock units	$ 3	(3)
Issuance of stock under employee stock purchase plan (in shares)	57,251
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
Translation adjustment						44
Net (loss) income						(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
Translation adjustment			57			57
Share-based compensation expense		167				167
Issuance of equity awards (in shares)	66,552
Issuance of equity awards	$ 3	(3)
Net (loss) income				(992)		(992)
Share-based compensation expense		167				167
Common stock repurchase (in shares)					1,858,139
Common stock repurchase					$ (2,230)	(2,230)
Issuance of stock upon vesting of restricted stock units (in shares)	66,552
Issuance of stock upon vesting of restricted stock units	$ 3	(3)
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
Issuance of stock under employee stock purchase plan	$ 3	65				68
Translation adjustment			118			118
Share-based compensation expense		147				147
Issuance of equity awards (in shares)	73,540
Issuance of equity awards	$ 4	(4)
Net (loss) income				(244)		(244)
Share-based compensation expense		147				147
Issuance of stock upon vesting of restricted stock units (in shares)	73,540
Issuance of stock upon vesting of restricted stock units	$ 4	(4)
Issuance of stock under employee stock purchase plan (in shares)	60,732
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