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Note 15 - Restatement to Previously Issued Condensed Consolidated Financial Statements - Restatements (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Deemed dividend attributable to preferred stock $ (11,479,308) $ (11,479,308) $ (11,479,308) $ (2,568,132)
Net loss applicable to common stockholders $ (15,621,885) $ (17,496,267) $ (22,884,242) $ (10,690,713)
Loss per common share -basic and diluted (in dollars per share) $ (5.08) $ (6.11) $ (5.50) $ (10.97)
Conversion of Series B convertible preferred stock to common stock    
Additional Paid in Capital, Convertible Preferred Stock [Member]        
Issuance of Series B convertible preferred stock, net of issuance costs $ 6,926,778      
Deemed Dividend on Series B convertible preferred stock 11,479,308      
Conversion of Series B convertible preferred stock to common stock (7,821,992)      
Additional Paid in Capital, Common Stock [Member]        
Issuance of Series B convertible preferred stock, net of issuance costs   $ 5,363,759    
Deemed Dividend on Series B convertible preferred stock   (11,479,308)    
Conversion of Series B convertible preferred stock to common stock   7,422,013    
Previously Reported [Member]        
Deemed dividend attributable to preferred stock (4,782,100) (4,782,100)    
Net loss applicable to common stockholders $ (8,924,677) $ (10,799,059)    
Loss per common share -basic and diluted (in dollars per share) $ (2.90) $ (3.77)    
Previously Reported [Member] | Additional Paid in Capital, Convertible Preferred Stock [Member]        
Issuance of Series B convertible preferred stock, net of issuance costs $ 12,290,537      
Deemed Dividend on Series B convertible preferred stock 4,782,100      
Conversion of Series B convertible preferred stock to common stock $ (7,056,421)      
Previously Reported [Member] | Additional Paid in Capital, Common Stock [Member]        
Issuance of Series B convertible preferred stock, net of issuance costs   $ 0    
Deemed Dividend on Series B convertible preferred stock   (4,782,100)    
Conversion of Series B convertible preferred stock to common stock   $ 6,656,442