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Note 15 - Fair Value Measurements and Derivatives (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Payments for (Proceeds from) Derivative Instrument, Investing Activities, Total		$ 5,000	$ 20,000
Interest Rate Swap [Member]
Derivative, Notional Amount		0
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge		4,000
Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Derivative, Notional Amount		425,000
Foreign Exchange Forward [Member]
Derivative, Notional Amount		$ 386,000	508,000
Maximum Remaining Maturity of Foreign Currency Derivatives (Month)		15 months
Foreign Exchange Forward [Member] \| Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount		$ 189,000
Foreign Exchange Forward [Member] \| Oerlikon Drive Systems [Member] \| Not Designated as Hedging Instrument [Member]
Payments for (Proceeds from) Derivative Instrument, Investing Activities, Total	$ 21,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (13,000)
Currency Swap [Member]
Derivative, Notional Amount		$ 1,118,000	$ 1,090,000