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Note O - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
NOL carryforward | $ 44,448 | $ 31,526 |  |
Inventory reserves | 2,872 | 2,241 |  |
Unrealized gains and losses | 69 | 59 |  |
Share-based compensation | 645 | 618 |  |
Foreign tax credit | 4,599 | 4,599 |  |
Research and development credits | 9,879 | 9,008 |  |
Interest | 2,840 | 1,784 |  |
ASC 842 Assets | 1,740 | 1,671 |  |
Other | 728 | 784 |  |
Deferred tax assets | 67,820 | 52,290 |  |
Less valuation allowance | (57,721) | (43,462) | $ (25,736) | $ 0
Deferred tax assets, net | 10,099 | 8,828 |  |
Depreciation and amortization | (8,600) | (7,402) |  |
ASC 842 Liabilities | (1,499) | (1,426) |  |
Deferred tax liabilities | (10,099) | (8,828) |  |
Deferred tax assets (liabilities), net | $ 0 | $ 0 |  |

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