Note 6 - Financial Instruments and Fair Value Measurements - Estimated Fair Values of Derivative Instruments (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments		$ 0	$ 0
Derivatives designated as hedging instruments		0	2,008
Not Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments		765	953
Derivatives designated as hedging instruments		0	0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments	[1]	0	0
Derivatives designated as hedging instruments	[1]	0	2,008
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as hedging instruments	[2]	765	953
Derivatives designated as hedging instruments	[2]	$ 0	$ 0

[1] Recorded in accounts payable and accrued expenses.

[2] Recorded in prepaid expenses and other current assets.