Note 6 - Financial Instruments and Fair Value Measurements - Estimated Fair Values of Derivative Instruments (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Designated as Hedging Instrument [Member]
Foreign exchange forward, Fair Value Asset		$ 560	$ 710
Foreign exchange forward, Fair Value Liability		1,629
Not Designated as Hedging Instrument [Member]
Foreign exchange forward, Fair Value Asset
Foreign exchange forward, Fair Value Liability		672	1,328
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Foreign exchange forward, Fair Value Asset	[1]
Foreign exchange forward, Fair Value Liability	[1]	1,629
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Foreign exchange forward, Fair Value Asset	[2]
Foreign exchange forward, Fair Value Liability		672	1,328
Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]
Foreign exchange forward, Fair Value Asset	[3]	560	710
Foreign exchange forward, Fair Value Liability	[3]

[1] Recorded in accounts payable and accrued expenses and other long-term liabilities.

[2] Recorded in accounts payable and accrued expenses.

[3] Recorded in prepaid expenses and other current assets and other long-term assets.