Note 3 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2016 IPR&D [Member] Sensima [Member]	Dec. 31, 2016 Know-How [Member] Sensima [Member]	Dec. 31, 2016 Developed Technology Rights [Member] Sensima [Member]	Dec. 31, 2016 Sensima [Member]
Note 3 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Cash					$ 145
Other tangible assets acquired, net of liabilities assumed					42
Intangible assets:
Intangible Assets		2,045	1,018	4,421
Total identifiable net assets acquired					7,671
Goodwill	6,571				6,571
Total net assets acquired					$ 14,242