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Note 9 - Earnings Per Share ("EPS") - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net loss $ (2,191,992) $ (1,356,187)
Convertible preferred stock dividends (156,162) (200,625)
Net loss available to common stockholders $ (2,348,154) $ (1,556,812)