Note 3 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Jul. 22, 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
Know-How [Member] | Sensima [Member]
Intangible assets:
Intangible Assets			1,018
Developed Technology Rights [Member] | Sensima [Member]
Intangible assets:
Intangible Assets			4,421
In Process Research and Development [Member] | Sensima [Member]
Intangible assets:
Intangible Assets			$ 2,045