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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
	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)

X

- Definition

Amount of paid and unpaid paid-in-kind dividends (PIK) declared for classes of stock, for example, but not limited to, common and preferred.

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