Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Stock compensation expense	$ 80	$ 250
Royalty accruals	10	10
Bad debt allowance	51	52
Net operating loss carryforwards	9,067	12,048
Credit carry-forwards	1,472	1,134
Inventory reserve	154	153
Depreciation	433	548
Research and Development Costs	2,233	1,053
Other	399	606
Total deferred tax assets	13,899	15,854
Deferred tax liabilities:
Goodwill	(296)	(238)
Intangible assets	(82)	(89)
Total deferred tax liabilities	(378)	(327)
Net deferred tax asset before valuation allowance	13,521	15,527
Valuation allowances for deferred tax assets	(13,697)	(15,699)	$ (15,627)
Net deferred tax liability	$ (176)	$ (172)