Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Stock compensation expense	$ 36	$ 80
Royalty accruals	9	10
Bad debt allowance	52	51
Net operating loss carryforwards	10,192	9,067
Credit carry-forwards	1,668	1,472
Inventory reserve	157	154
Depreciation	402	433
Research and Development Costs	1,920	2,233
Other	569	399
Total deferred tax assets	15,005	13,899
Deferred tax liabilities:
Goodwill	(353)	(296)
Intangible assets	(78)	(82)
Total deferred tax liabilities	(431)	(378)
Net deferred tax asset before valuation allowance	14,574	13,521
Valuation allowances for deferred tax assets	(14,761)	(13,697)	$ (15,699)
Net deferred tax liability	$ (187)	$ (176)