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Note 15 - Restatement to Previously Issued Condensed Consolidated Financial Statements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Preferred Stock, Deemed Dividend $ 11,479,308 $ 11,479,308 $ 11,479,308 $ 2,568,132
Series B Convertible Preferred Stock [Member]        
Deemed Dividend on Series B Convertible Preferred Stock 11,479,308      
Previously Reported [Member]        
Preferred Stock, Deemed Dividend 4,782,100 $ 4,782,100    
Previously Reported [Member] | Series B Convertible Preferred Stock [Member]        
Preferred Stock, Deemed Dividend $ 4,782,100