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Note 15 - Fair Value Measurement - Summary of the Fair Values of the Company's Derivative Instrument Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Derivative instrument asset $ 26,103
Derivative instrument liability
Fair Value, Inputs, Level 1 [Member]    
Derivative instrument asset
Derivative instrument liability
Fair Value, Inputs, Level 2 [Member]    
Derivative instrument asset 26,103
Derivative instrument liability
Fair Value, Inputs, Level 3 [Member]    
Derivative instrument asset
Derivative instrument liability