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Note 13 - Earnings (Loss) Per Share - Common Stock ("EPS") - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net loss | $ (1,829,567) | $ (1,425,743) | $ (1,803,508) | $ (1,641,315) | $ (1,655,465) | $ (2,191,992) | $ (5,058,818) | $ (5,488,772)
Deemed dividend from trigger of anti-dilution provision feature |  |  |  | (1,428,966) |  |  |  | (1,428,966)
Convertible preferred stock dividends |  |  |  |  |  |  |  | (198,033)
Net loss available to common stockholders | $ (1,829,567) |  |  | $ (3,070,281) |  |  | $ (5,058,818) | $ (7,115,771)

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