Note 4 - Goodwill and Acquisition-related Intangible Assets, Net (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Cost Of Revenue [Member]
Amortization of Intangible Assets	$ 500,000	$ 500,000	$ 1,500,000	$ 1,200,000
Goodwill, Period Increase (Decrease)	$ 0		$ 0