Note 7 - Derivative Instruments (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Derivative, Notional Amount		$ 15,408
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative, Notional Amount	$ 0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Minimum [Member]
Derivative, Term of Contract (Month)	3 months
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Maximum [Member]
Derivative, Term of Contract (Month)	12 months
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Maximum [Member]
Derivative, Term of Contract (Month)	3 years