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Note 6 - Fair Value Measurement - Summary of the Fair Values of the Company's Derivative Instrument Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Derivative instrument asset $ 172,888  
Derivative instrument liability   $ 2,027,086
Fair Value, Inputs, Level 1 [Member]    
Derivative instrument asset  
Derivative instrument liability  
Fair Value, Inputs, Level 2 [Member]    
Derivative instrument asset 172,888  
Derivative instrument liability   2,027,086
Fair Value, Inputs, Level 3 [Member]    
Derivative instrument asset  
Derivative instrument liability