Income Taxes (Schedule of components of income tax expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Oct. 01, 2022	Jul. 02, 2022	Apr. 02, 2022	Jan. 01, 2022	Oct. 02, 2021	Jul. 03, 2021	Apr. 03, 2021	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Income Tax Disclosure [Abstract]
Loss from continuing operations before income taxes	$ 414	$ (16,898)	$ 3,437	$ 1,189	$ (5,736)	$ (105)	$ (4,569)	$ 2,810	$ (11,858)	$ (7,600)	$ (50,042)
Canadian statutory rate									26.50%	26.50%	26.50%
Income tax benefit at statutory rate									$ (3,142)	$ (2,014)	$ (13,261)
Stock-based compensation									978	(4,796)	2,159
Disallowed executive compensation									374	138	2,801
Foreign tax rate differential									76	(31)	(105)
Change in valuation allowance									(471)	975	560
Change in enacted tax rates									(340)	(442)	250
CARES Act									0	0	2,472
Change in valuation of state deferred tax assets									0	0	(3,900)
Other									185	(258)	1,374
Income tax benefit	$ 1,285	$ (4,964)	$ 1,152	$ 187	$ 342	$ 2,804	$ (10,100)	$ 526	$ (2,340)	$ (6,428)	$ (7,650)