Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Goodwill	$ 6,571	$ 6,571
Sensima [Member]
Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Cash		145
Other tangible assets acquired, net of liabilities assumed		42
Total identifiable net assets acquired		7,671
Goodwill		6,571
Total net assets acquired		14,242
Sensima [Member] | Know-How [Member]
Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Intangible Assets		1,018
Sensima [Member] | IPR&D [Member]
Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Intangible Assets		2,045
Developed Technology Rights [Member] | Sensima [Member]
Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Intangible Assets		$ 4,421