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Note 15 - Other Financial Statement Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | December 31,
|  | 2023 |  | 2022
Raw materials |  | $ | 271 |  |  | $ | 307 |
Work in process |  |  | 9 |  |  |  | 7 |
Total gross inventory |  |  | 280 |  |  |  | 314 |
Reserve for excess and obsolete inventory |  |  | (76 | ) |  |  | (49 | )
Inventories, net |  | $ | 204 |  |  | $ | 265 |
Property, Plant and Equipment [Table Text Block] |
|  | December 31,
|  | 2023 |  | 2022
Machinery and equipment |  | $ | 639 |  |  | $ | 639 |
Gross property, plant and equipment |  |  | 639 |  |  |  | 639 |
Less: Accumulated depreciation |  |  | (639 | ) |  |  | (638 | )
Property, plant and equipment, net |  | $ | — |  |  | $ | 1 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | December 31,
|  | 2023 |  | 2022
Intellectual property |  | $ | 214 |  |  | $ | 214 |
Gross intangible assets |  |  | 214 |  |  |  | 214 |
Less: Accumulated amortization |  |  | (157 | ) |  |  | (136 | )
Intangible assets, net |  | $ | 57 |  |  | $ | 78

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