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Note 10 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		Fiscal Years
		2023				2022				2021
Income (loss) before income taxes:
U.S.		$	(225	)		$	(4,116	)		$	(6,461	)
Foreign			(36	)			(53	)			(36	)
Income (loss) before income taxes		$	(261	)		$	(4,169	)		$	(6,497	)
Provision for income taxes:
Current:
State		$	9			$	3			$	3
Foreign			(6	)			36				22
Subtotal			3				39				25
Deferred:
Foreign			(1	)			59				94
Subtotal			(1	)			59				94
Provision for income taxes		$	2			$	98			$	119

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Fiscal Years
		2023				2022				2021
Income tax benefit at statutory rate		$	(55	)		$	(876	)		$	(1,364	)
State taxes			9				3				3
Foreign taxes			—				106				124
Stock compensation and other permanent differences			(740	)			21				(155	)
PPP loan forgiveness			—				—				(250	)
R&D tax credits			(480	)			(318	)			(230	)
Expired tax attributes			1,290				3,563				3,303
Future benefit of deferred tax assets not recognized			(22	)			(2,401	)			(1,312	)
Provision for income taxes		$	2			$	98			$	119

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		December 31, 2023				January 1, 2023
Deferred tax assets:
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
Deferred tax liabilities:
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	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

		Fiscal Years
		2023				2022				2021
Beginning balance of unrecognized tax benefits		$	2,249			$	2,118			$	2,175
Additions (subtractions) for tax positions related to the prior year			2				—				(7	)
Additions for tax positions related to the current year			262				185				128
Lapse of statutes of limitations			—				(54	)			(178	)
Ending balance of unrecognized tax benefits		$	2,513			$	2,249			$	2,118

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