Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Total Revenue | $ 18,397 | $ 27,055 | $ 60,850 | $ 76,478 |
| Product [Member] | ||||
| Revenue | 6,413 | 13,035 | 20,046 | 35,924 |
| Service [Member] | ||||
| Revenue | 10,035 | 10,782 | 33,749 | 31,097 |
| Car Sharing [Member] | ||||
| Car-sharing revenue | 0 | 1,231 | 1,942 | 3,517 |
| Grant [Member] | ||||
| Revenue | 9 | 59 | 101 | 251 |
| Transferred at Point in Time [Member] | ||||
| Revenue | 14,870 | 22,149 | 47,894 | 62,026 |
| Transferred at Point in Time [Member] | Product [Member] | ||||
| Revenue | 6,413 | 13,035 | 20,046 | 35,924 |
| Transferred at Point in Time [Member] | Service [Member] | ||||
| Revenue | 7,095 | 8,015 | 24,516 | 22,997 |
| Transferred at Point in Time [Member] | Warranty and Other [Member] | ||||
| Revenue | 1,362 | 1,099 | 3,332 | 3,105 |
| Transferred over Time [Member] | ||||
| Revenue | 3,518 | 3,616 | 10,913 | 10,684 |
| Transferred over Time [Member] | Service [Member] | ||||
| Revenue | 2,940 | 2,767 | 9,233 | 8,100 |
| Transferred over Time [Member] | Warranty and Other [Member] | ||||
| Revenue | $ 578 | $ 849 | $ 1,680 | $ 2,584 |
| X | ||||||||||
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of revenue that is not accounted for under Topic 606. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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