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Note 14 - Earnings (Loss) Per Share - Common Stock ("EPS") - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($)		3 Months Ended				6 Months Ended
	Feb. 14, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net loss		$ (1,572,709)	$ (3,370,282)	$ (1,425,743)	$ (1,803,508)	$ (4,942,991)	$ (3,229,251)
Deemed dividends related to down-round features	$ (41,688)					(112,686)
Net loss available to common stockholders (basic and diluted)		$ (1,572,709)		$ (1,425,743)		$ (5,055,677)	$ (3,229,251)

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