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Note 8 - Derivative Instruments (Details Textual)	6 Months Ended
Note 8 - Derivative Instruments (Details Textual)	Jun. 30, 2019
Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member] \| Minimum [Member]
Derivative, Term of Contract	90 days
Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member] \| Maximum [Member]
Derivative, Term of Contract	1 year
Foreign Exchange Forward [Member] \| Maximum [Member] \| Not Designated as Hedging Instrument [Member]
Derivative, Term of Contract	3 years