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Note 12 - Earnings (Loss) Per Share - Common Stock ("EPS") - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic Numerator:
Net loss	$ (1,425,743)	$ (1,803,508)	$ (1,655,465)	$ (2,191,992)	$ (3,229,251)	$ (3,847,456)
Convertible preferred stock dividends			(41,870)			(198,033)
Net loss available to common stockholders	$ (1,425,743)		$ (1,697,335)		$ (3,229,251)	$ (4,045,489)

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