Note 3 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible assets:
Goodwill	$ 6,571	$ 6,571
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:
Total identifiable net assets acquired	7,671
Goodwill	6,571
Total net assets acquired	14,242
Sensima [Member] | IPR&D [Member]
Intangible assets:
Intangible Assets	2,045
Know-How [Member] | Sensima [Member]
Intangible assets:
Intangible Assets	1,018
Developed Technology Rights [Member] | Sensima [Member]
Intangible assets:
Intangible Assets	$ 4,421