Note 6 - Goodwill and Acquisition-related Intangible Assets, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Goodwill, Period Increase (Decrease)	0	0
Cost Of Revenue [Member]
Amortization of Intangible Assets	$ 2,100,000	$ 1,800,000	$ 700,000