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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