Note 4 - Goodwill and Acquisition-related Intangible Assets, Net - Acquisition-related Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Gross Amount	$ 7,484	$ 7,484
Accumulated Amortization	(4,995)	(4,482)
Net Amount	2,489	3,002
Know-How [Member]
Gross Amount	1,018	1,018
Accumulated Amortization	(551)	(500)
Net Amount	467	518
Developed Technology Rights [Member]
Gross Amount	6,466	6,466
Accumulated Amortization	(4,444)	(3,982)
Net Amount	$ 2,022	$ 2,484