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Note 2 - Investment in Innolectric (Details Textual) $ in Thousands, € in Millions			3 Months Ended	6 Months Ended
	Feb. 01, 2023 USD ($)	Feb. 01, 2023 EUR (€)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 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			$ 11,009	11,009			$ 0
Innolectric AG [Member]
Loans and Leases Receivable, Related Parties			$ 2,000	$ 2,000		€ 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			$ 400	$ 400
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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