Consolidated Statement 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. 30, 2017	15,017,522				2,823,172
Balance at Dec. 30, 2017	$ 751	$ 104,540	$ (2,395)	$ (65,878)	$ (14,987)	$ 22,031
Issuance of stock under employee stock purchase plan (in shares)	45,408
Issuance of stock under employee stock purchase plan	$ 2	192				194
Translation adjustment			(70)			(70)
Share-based compensation expense		112				112
Net income				1,051		1,051
Balance (in shares) at Mar. 31, 2018	15,062,930				2,823,172
Balance at Mar. 31, 2018	$ 753	104,844	(2,465)	(64,827)	$ (14,987)	23,318
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
Issuance of stock upon vesting of restricted stock units (in shares)	57,148
Issuance of stock upon vesting of restricted stock units	$ 3	(3)
Share-based compensation expense		241				241
Net 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