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Note 12 - Loss Per Share - Summary of Basic and Diluted Loss Per Common Share (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net loss $ (1,682,671) $ (663,396) $ (6,944,261)
Dividends to Series B preferred shares (1,271,782) (1,335,733) (1,808,811)
Preferred deemed dividend (504,577)
Net loss attributable to common shareholders, continuing operations $ (3,459,030) $ (1,999,129) $ (8,753,072)
Weighted average common shares –outstanding , basic and diluted (in shares) 2,861,928 1,414,775 1,383,440
Basic and diluted loss per share, continuing operations (in dollars per share) $ (1.21) $ (1.41) $ (6.33)
Net income attributable to common shareholders, discontinued operations $ 554,506 $ 849,701
Net loss attributable to common shareholders $ (3,459,030) $ (1,444,623) $ (7,903,371)
Basic and diluted loss per share (in dollars per share) $ (1.21) $ (1.02) $ (5.72)
Series B Preferred Stock [Member]      
Dividends to Series B preferred shares $ (1,271,782) $ (1,335,733) $ (1,808,811)