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Note 9 - 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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic Numerator:
Net loss	$ (1,641,315)	$ (1,605,784)	$ (5,488,772)	$ (4,751,301)
Deemed dividend from trigger of anti-dilution provision feature	(1,428,966)		(1,428,966)
Convertible preferred stock dividends		(200,625)	(198,033)	(601,875)
Net loss available to common stockholders	$ (3,070,281)	$ (1,806,409)	$ (7,115,771)	$ (5,353,176)

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