Note 8 - Fair Value Measurements (Details Textual) - Foreign Exchange Contract [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net	$ (300,000)	$ 100,000	$ 8,000	$ (600,000)
Other Current Liabilities [Member]
Derivative Liability, Current	28,000		28,000		$ 62,000
Derivative Asset, Notional Amount	$ 7,100,000		$ 7,100,000		$ 6,700,000