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Note 2 - Investment in Innolectric (Details Textual) $ in Thousands, € in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 01, 2023 USD ($) | Feb. 01, 2023 EUR (€) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 EUR (€) | Mar. 31, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  |  | $ 9,856 |  |  |  |  | $ 9,265 |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  | 300 |  | $ 200 |  |  |  |
Innolectric AG [Member] |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Related Parties, Additions | € |  |  |  | € 0.2 |  | € 0.5 |  |  |
Loans and Leases Receivable, Related Parties |  |  | $ 3,300 |  |  |  | € 3.0 | $ 2,900 | € 2.8
Loans and Leases Receivable, Interest Rate |  |  | 5.00% |  |  |  | 5.00% |  |
Innolectric AG [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 33.33% |  |  |  |  |  |  |  |
Payments to Acquire Interest in Subsidiaries and Affiliates | $ 8,800 | € 8.0 |  |  |  |  |  |  |
Business Acquisition, Transaction Costs | 1,300 |  |  |  |  |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 11,000 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | $ 1,000 |  |  |  |  |  |  |  |

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