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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Reserves | $ 472 | $ 267
Property and equipment | 165 |
Property and equipment |  | (2)
Accrued expenses | 593 | 106
Right-of-use Asset | (253) | (91)
Right-of-use Liability | 253 | 91
IRC 163(j) Interest Deduction | 18 | 18
Debt issuance costs | 286 | 0
Non-qualified stock options | 1,469 | 1,074
IRC Section 174 | 196 | 0
R&D credits | 2,312 | 1,801
Net foreign carryforwards | 3,664 | 3,485
US net operating loss and credit carryforwards | 37,953 | 35,448
Intangibles | (3,737) | (11)
Total deferred tax liabilities, net | 43,391 | 42,186
Valuation allowance | (43,419) | (42,186)
Net deferred tax liabilities | $ (28) | $ 0

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