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Note 9 - Loss Per Share - Summary of Basic and Diluted Loss Per Common Share (Details) - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Net income / (loss), continuing operations $ (765,615) $ 771,825
Dividend Series B Preferred shares (949,152) (850,708)
Preferred deemed dividend (504,577)
Net loss attributable to common shareholders, continuing operations $ (2,219,344) $ (78,883)
Weighted average common shares – outstanding, continuing operations (in shares) 12,340,060 11,133,764
Basic and diluted loss per share, continuing operations (in dollars per share) $ (0.18) $ (0.01)
Net loss attributable to common shareholders, discontinued operations $ (1,421,001)
Net loss attributable to common shareholders $ (2,219,344) $ (1,499,884)
Basic and diluted loss per share (in dollars per share) $ (0.18) $ (0.13)
Preferred Class B [Member]    
Dividend Series B Preferred shares $ (949,152) $ (850,708)