Note 8 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Inventory reserve	$ 17	$ 19
Allowance for doubtful accounts	12	15
Lease liability	72	19
Unrealized gains on marketable securities	0	3
Stock-based compensation	9	1
Depreciation and amortization	14	13
Federal tax loss carryforwards	72	77
Other reserves and accruals	35	24
Total deferred tax assets	231	171
Right-of-use asset	72	19
Total deferred tax liabilities	72	19
Net deferred tax assets before valuation allowance	159	152
Valuation allowance	0	0
Net deferred tax assets	$ 159	$ 152