Note 7 - Loss Per Share (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Numerator
Net loss available in basic and diluted calculation	$	(2,506,869	)	$	(992,095	)	$	(6,640,301	)	$	(4,877,542	)
Comprehensive loss		(2,506,869	)		(992,095	)		(6,640,301	)		(4,877,542	)
Denominator:
Weighted average common shares outstanding-basic		13,252,605			6,232,761			12,178,285			6,283,567
Effect of diluted stock options, warrants and preferred stock (1)		-			-			-			-
Weighted average common shares outstanding-basic		13,252,605			6,262,761			12,178,285			6,283,567
Loss per common share-basic and diluted	$	(0.19	)	$	(0.16	)	$	(0.55	)	$	(0.78	)

	Year Ended December 31,
	2017			2016
Numerator:
Net loss available in basic and diluted calculation	$	(7,746,593	)	$	(6,526,014	)
Other comprehensive income:
Unrealized gain (loss) from marketable securities		-			1,501
Comprehensive (loss)		(7,746,593	)		(6,524,513	)
Denominator:
Weighted average common shares outstanding-basic		6,362,989			2,823,345
Effect of dilutive stock options, warrants and preferred stock (1)		-			-
Weighted average common shares outstanding-basic		6,362,989			2,823,345
Loss per common share-basic and diluted	$	(1.22	)	$	(2.31	)