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Note 2 - Investment in Innolectric (Details Textual)
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Feb. 01, 2023
USD ($)
Feb. 01, 2023
EUR (€)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
EUR (€)
Dec. 31, 2022
USD ($)
Payments to Acquire Interest in Subsidiaries and Affiliates       $ 9,975 $ (0)    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures     $ 9,978 9,978     $ 0
Innolectric AG [Member]              
Loans and Leases Receivable, Related Parties     $ 1,900 $ 1,900   € 1.8  
Loans and Leases Receivable, Interest Rate     5.00% 5.00%   5.00%  
Innolectric AG [Member] | Power Solutions and Protection Segment [Member]              
Net Income (Loss) Attributable to Noncontrolling Interest     $ (300) $ (700)      
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