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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Inputs, Level 3 [Member]    
Convertible Debt, Fair Value Disclosures $ 2,300,000 $ 4,800,000
Minimum [Member]    
Property, Plant and Equipment, Useful Life 5 years  
Maximum [Member]    
Property, Plant and Equipment, Useful Life 15 years  
Asset Impairment Charges $ 0  
Property, Plant and Equipment, Disposals $ 0  
Number of Reporting Units 1