Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023
Net operating losses	$ 42,220	$ 43,110
Accruals and reserves	1,569	1,284
Credits carryforward	6,730	6,004
Depreciation and amortization	5,841	6,488
Stock-based compensation	447	1
Operating lease liability	216	327
Gross deferred tax assets	57,023	57,214
Right-of-use asset	(215)	(328)
Withholding tax on future distribution	(125)	(125)
Gross deferred tax liabilities	(340)	(453)
Net deferred tax assets	56,683	56,761
Valuation allowance	(56,783)	(56,862)
Total deferred tax liability	$ (100)	$ (101)