Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 01, 2023	Jan. 02, 2022
Net operating losses	$ 43,110	$ 45,197
Accruals and reserves	1,284	1,347
Credits carryforward	6,004	5,660
Depreciation and amortization	6,488	7,820
Stock-based compensation	1	403
Operating lease liability	327	409
Gross deferred tax assets	57,214	60,836
Right-of-use asset	(328)	(400)
Withholding tax on future distribution	(125)	(125)
Gross deferred tax liabilities	(453)	(525)
Net deferred tax assets	56,761	60,311
Valuation allowance	(56,862)	(60,353)
Total deferred tax liability	$ (101)	$ (42)