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Note 3 - Intangible Assets
 12 Months Ended
Dec. 31, 2014
Disclosure Text Block [Abstract]  
Intangible Assets Disclosure [Text Block]

3.   Intangible Assets


 Intangible assets balance was zero and $31,000 as of December 31, 2014 and 2013, respectively. Intangible asset amortization expense for the years ended December 31, 2014, 2013 and 2012 was $31,000, $74,000, and $0.4 million, respectively.


Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. During the years ended December 31, 2014, 2013 and 2012, there were no indicators of impairment related to the Company’s intangible assets.