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Note 11 - Preferred Shares - Dividends Series B Preferred Shares (Details) - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Balance (in shares) 19,605  
Balance $ 18,757,361  
Dividends declared (in shares) 81  
Dividends declared $ 78,639  
Redemption of preferred shares (in shares) (11,686)  
Redemption of preferred shares $ (11,686,000)  
Preferred deemed dividend $ 504,577
Balance (in shares) 8,000  
Balance $ 7,654,577  
Ordinary Preferred Stock [Member]    
Balance 14,500,000  
Dividends declared  
Redemption of preferred shares (8,155,055)  
Preferred deemed dividend  
Balance 6,344,945  
Preferred Stock Issued as Dividends [Member]    
Balance 4,257,361  
Dividends declared 78,639  
Redemption of preferred shares (3,530,945)  
Preferred deemed dividend 504,577  
Balance $ 1,309,632