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Note 2 - Investment in Innolectric (Details Textual)
$ in Thousands, € in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2023
EUR (€)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
EUR (€)
Feb. 01, 2023
USD ($)
Payments to Acquire Interest in Subsidiaries and Affiliates $ 9,975   $ (0)    
Innolectric AG [Member]          
Loans and Leases Receivable, Related Parties $ 2,000     € 1.8  
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