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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Reserves | $ 249 | $ 472
Property and equipment | 57 | 165
Accrued expenses | 514 | 593
Right-of-use Asset | (254) | (253)
Right-of-use Liability | 254 | 253
IRC 163(j) Interest Carryforward | 704 | 18
Debt issuance costs | 135 | 286
Non-qualified stock options | 1,708 | 1,469
IRC Section 174 | 593 | 196
R&D credits | 2,312 | 2,312
Net foreign carryforwards | 3,753 | 3,664
US net operating loss and contribution carryforwards | 38,010 | 37,953
Intangibles | (3,818) | (3,737)
Total deferred tax liabilities, net | 44,217 | 43,391
Valuation allowance | (44,290) | (43,419)
Net deferred tax liabilities | $ (73) | $ (28)

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