Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Income Tax Disclosure [Line Items]
Deferred tax assets, valuation allowance	$ 4,826	$ 5,267	$ 4,284
U.S. [Member] | Scientific research investment tax credits [Member] | Federal [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward, amount	2,300	1,600
U.S. [Member] | Research and development tax credits [Member] | State [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward, amount	300	900
U.S. [Member] | Capital loss carryforward [Member] | Federal [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards	48,400	64,800
U.S. [Member] | Capital loss carryforward [Member] | State [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards	3,000	3,300
Canada [Member] | Capital loss carryforward [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards	27,800	27,800
Canada [Member] | Capital loss carryforward [Member] | Foreign tax authority [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards	$ 4,000	$ 6,000