Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Total Shareholders' Equity	Non-controlling Interest	Total
Balance (in shares) at Dec. 31, 2017	7,376
Balance at Dec. 31, 2017	$ 70	$ 1,460	$ 11,951	$ 13,481		$ 13,481
Common stock issued pursuant to rights offering (in shares)	1,582
Common stock issued pursuant to rights offering	$ 18	5,119		5,137		$ 5,137
Exercise of stock options (in shares)	102					102
Exercise of stock options	$ 2	432		434		$ 434
Stock-based compensation (in shares)	25
Stock-based compensation	$ 1	364		365		365
Net income (loss)			4,862	4,862		4,862
Balance (in shares) at Dec. 30, 2018	9,085
Balance at Dec. 30, 2018	$ 91	7,375	15,075	22,541		22,541
Cumulative effect of change in accounting principle			(1,738)	(1,738)		$ (1,738)
Exercise of stock options (in shares)	5					5
Exercise of stock options		20		20		$ 20
Other			(3)	(3)		(3)
Stock-based compensation (in shares)	182
Stock-based compensation	$ 2	461		463		463
Net income (loss)			(649)	(649)	$ (598)	(1,247)
Balance (in shares) at Dec. 29, 2019	9,272
Balance at Dec. 29, 2019	$ 93	$ 7,856	$ 14,423	$ 22,372	$ (598)	$ 21,774