Note 6 - Derivative Instruments - Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Derivative, Pre-tax gain (loss) recognized in OCI	$ 3,306
Foreign Exchange Forward [Member]
Derivative, Pre-tax gain (loss) recognized in OCI	363
Interest Rate Swap [Member]
Derivative, Pre-tax gain (loss) recognized in OCI	$ 2,943