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 stock upon vesting of restricted stock units (in shares)	57,148
Issuance of stock upon vesting of restricted stock units	$ 3	(3)
Net (loss) income				1,463		1,463
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. 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 stock upon vesting of restricted stock units (in shares)	60,000
Issuance of stock upon vesting of restricted stock units	$ 3	(3)
Net (loss) income				(5,945)		(5,945)
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