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Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Warrants Activity [Table Text Block]

	Shares			Weighted Average Exercise Price
Outstanding as of January 1, 2017
Warrants granted		488,611		$	11.25
Warrants exercised		(488,611	)		3.12
Outstanding as of December 31, 2017

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Outstanding Warrants to Purchase Shares		Exercise Price		Expiration Date

2014 public offering		6,483	$	540.00	January 29, 2019
2018 warrants		3,869,216		4.05	May 30, 2022
		3,875,699

Warrant [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Initial valuation
Common stock price		$9.00
Exercise price		$11.25
Expected volatility		50%
Dividend yield		0%
Risk-free interest rate	0.79%	-	1.88%
Expected term (in years)	0.24	-	5

June 30, 2017 valuation
Common stock price		$6.00
Exercise price		$3.12
Expected volatility		50%
Dividend yield		0%
Risk-free interest rate	0.79	-	1.88%
Expected term (in years)	0.08	-	4.76

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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