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Note 9 - Preferred Stock - Preferred Stock Summary (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Preferred stock, shares outstanding (in shares) 3,402 3,450
Preferred Stock $ 2,337,867 $ 1,971,333
Series B Convertible Preferred Stock [Member]    
Preferred stock, shares outstanding (in shares) 100 100
Preferred Stock $ 76,095 $ 76,095
Series C Convertible Preferred Stock [Member]    
Preferred stock, shares outstanding (in shares) 2,150
Preferred Stock $ 705,238
Series E Convertible Preferred Stock [Member]    
Preferred stock, shares outstanding (in shares) 1,200
Preferred Stock $ 1,190,000
Series F Convertible Preferred Stock [Member]    
Preferred stock, shares outstanding (in shares) 2,302
Preferred Stock $ 1,418,822
Series G Convertible Preferred Stock [Member]    
Preferred stock, shares outstanding (in shares) 1,000
Preferred Stock $ 842,950