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Note 2 - Acquisition - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Jul. 22, 2014
Goodwill $ 6,571 $ 6,571  
Sensima [Member]      
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] | Developed Technology Rights [Member]      
Intangible Assets     4,421
Sensima [Member] | Know-How [Member]      
Intangible Assets     1,018
Sensima [Member] | IPR&D [Member]      
Intangible Assets     $ 2,045