v3.19.3
Note 2 - Summary of Significant Accounting Policies - Fair Value Measurements Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Warrant liability $ 140
Fair Value, Recurring [Member]    
Total financial liabilities   140
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total financial liabilities  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total financial liabilities  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Total financial liabilities   140
Warrant [Member] | Fair Value, Recurring [Member]    
Warrant liability   140
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Warrant liability  
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Warrant liability  
Warrant [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Warrant liability   $ 140