Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Stock compensation expense	$ 250	$ 272
Goodwill	0	182
Royalty accruals	10	10
Bad debt allowance	52	53
Net operating loss carryforwards	12,048	12,158
Credit carry-forwards	1,134	1,058
Inventory reserve	153	233
Depreciation	548	585
Research and Development Costs	1,053	528
Other	606	471
Total deferred tax assets	15,854	15,550
Deferred tax liabilities:
Goodwill	(238)	0
Intangible assets	(89)	(100)
Total deferred tax liabilities	(327)	(100)
Net deferred tax asset before valuation allowance	15,527	15,450
Valuation allowances for deferred tax assets	(15,699)	(15,627)	$ (14,950)
Net deferred tax liability	$ (172)	$ (177)