Note 3 - Derivative Financial Instruments (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Income [Member]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (100,000)	$ (100,000)	$ (30,000)	$ 300,000
Foreign Exchange Forward [Member]
Derivative, Term of Contract			1 year
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			$ (500,000)		$ (400,000)