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Note 4 - Balance Sheet Details (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equipment [Member]      
Asset Impairment Charges   $ 905,000  
Assets Held-for-sale, Long Lived, Fair Value Disclosure   115,000  
Proceeds from Sale of Property, Plant, and Equipment $ 241,000    
Asset Impairment Charges 0 905,000 $ 0
Depreciation 734,000 $ 578,000 $ 333,000
Proceeds from Sale of Property, Plant, and Equipment $ 241,000