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Note O - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Domestic |  | $ | (21,229 | ) |  | $ | (20,288 | ) |  |  | (35,279 | )
Foreign |  |  | (32,931 | ) |  |  | (30,936 | ) |  |  | (16,108 | )
Total loss before income taxes |  | $ | (54,160 | ) |  | $ | (51,224 | ) |  |  | (51,387 | )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
Current: |  | 2021 |  |  | 2020 |  |  | 2019 |
Federal |  | $ | — |  |  | $ | 41 |  |  | $ | — |
State |  |  | 2 |  |  |  | 2 |  |  |  | 16 |
Foreign |  |  | — |  |  |  | — |  |  |  | 97 |
Total |  | $ | 2 |  |  | $ | 43 |  |  | $ | 113 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | (172 | ) |  | $ | 16,375 |
State |  |  | — |  |  |  | — |  |  |  | 1,716 |
Foreign |  |  | — |  |  |  | 7,357 |  |  |  | (3,542 | )
Total |  | $ | — |  |  | $ | 7,185 |  |  | $ | 14,549 |
Income tax (benefit) expense |  | $ | 2 |  |  | $ | 7,228 |  |  | $ | 14,662 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2021 |  |  | 2020 |
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 | )
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, net |  | $ | — |  |  | $ | — |
Summary of Valuation Allowance [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Beginning Balance, January 1 |  | $ | 43,462 |  |  | $ | 25,736 |  |  | $ | — |
Change charged to expense/(income) |  |  | 13,822 |  |  |  | 17,137 |  |  |  | 25,736 |
Change charged to currency translation adjustment |  |  | 437 |  |  |  | 589 |  |  |  | — |
Ending Balance, December 31 |  | $ | 57,721 |  |  | $ | 43,462 |  |  | $ | 25,736 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Expected taxes at statutory rate |  | $ | (11,374 | ) |  | $ | (10,775 | ) |  | $ | (10,791 | )
PPP loan forgiveness |  |  | (1,308 | ) |  |  | — |  |  |  | — |
Non-deductible/non-taxable items |  |  | 897 |  |  |  | 1,132 |  |  |  | 962 |
Foreign rate differences |  |  | 107 |  |  |  | 1,153 |  |  |  | 590 |
Foreign permanent differences |  |  | (1,320 | ) |  |  | (1,002 | ) |  |  | (671 | )
Changes in valuation allowance |  |  | 13,822 |  |  |  | 17,137 |  |  |  | 25,736 |
Share-based compensation |  |  | 468 |  |  |  | 426 |  |  |  | 607 |
Research and development credits |  |  | (872 | ) |  |  | (744 | ) |  |  | (1,616 | )
Alternative Minimum Tax |  |  | — |  |  |  | (172 | ) |  |  | — |
Foreign other |  |  | — |  |  |  | 12 |  |  |  | 27 |
Other, net |  |  | (418 | ) |  |  | 61 |  |  |  | (182 | )
Tax (benefit) expense |  | $ | 2 |  |  | $ | 7,228 |  |  | $ | 14,662 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Unrecognized tax benefits — January 1 |  | $ | 181 |  |  | $ | 181 |  |  | $ | 181 |
Gross increases — tax positions in prior period |  |  | — |  |  |  | — |  |  |  | — |
Gross decreases — tax positions in prior period |  |  | — |  |  |  | — |  |  |  | — |
Unrecognized tax benefits — December 31 |  | $ | 181 |  |  | $ | 181 |  |  | $ | 181 |

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