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Note O - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
NOL carryforward | $ 49,469 | $ 47,901 |  |  |
Inventory reserves | 3,195 | 2,892 |  |  |
Unrealized gains and losses | 355 | 363 |  |  |
Share-based compensation | 1,013 | 914 |  |  |
Foreign tax credit | 4,599 | 4,599 |  |  |
Research and development credits | 10,998 | 10,505 |  |  |
Capitalized research and development | 8,717 |  |  |  |
Interest | 5,659 | 3,966 |  |  |
ASC 842 Assets | 1,561 | 1,602 |  |  |
Other | 941 | 776 |  |  |
Deferred tax assets | 86,507 | 73,518 |  |  |
Less valuation allowance | (78,124) | (69,680) | $ (69,680) | $ (57,721) | $ (43,462)
Deferred tax assets, net | 8,383 | 3,838 |  |  |
Depreciation and amortization | (6,992) | (2,441) |  |  |
ASC 842 Liabilities | (1,391) | (1,397) |  |  |
Deferred tax liabilities | (8,383) | (3,838) |  |  |
Deferred tax assets (liabilities), net | $ 0 | $ 0 |  |  |

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