Note 9 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory reserve	$ 19	$ 12
Allowance for doubtful accounts	15	20
Lease liability	19	31
Unrealized gains on marketable securities	3	166
Stock-based compensation	1	8
Depreciation and amortization	13	11
Federal tax loss carryforwards	77	0
Other reserves and accruals	24	17
Total deferred tax assets	171	265
Right-of-use asset	19	31
Total deferred tax liabilities	19	31
Net deferred tax assets before valuation allowance	152	234
Valuation allowance	0	0
Net deferred tax assets (liabilities)	$ 152	$ 234