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Note 7 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life		Aggregate Intrinsic Value

Outstanding at December 31, 2017		1,156,027		$	3.92

Granted		80,000		$	3.00
Forfeited		(2,435	)	$	3.53
Expired		(27,182	)	$	4.67

Outstanding at March 31, 2018		1,206,410		$	3.84		8.5		--

Vested and expected to vest at March 31, 2018		943,103		$	4.07		8.3		--

Exercisable at March 31, 2018		306,582		$	6.22		5.7		--

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected life (years)	5.6
Risk-free interest rate	2.7	%
Expected volatility	98	%
Dividend yield	0	%

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

			Weighted Average
	Number of Shares		Grant Date Fair Value
Balance at December 31, 2017		416	$	17.60
Granted		--
Vested		--
Forfeited		--
Outstanding at March 31, 2018		416	$	17.60

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

	Number of Shares		Weighted-Average Exercise Price Per Share
Balance at December 31, 2017		4,828,723	$	9.37
Warrants granted		304,818		2.68
Warrants canceled		--		--
Warrants exercised		--		--

Outstanding at March 31, 2018		5,133,541	$	8.97

Exercisable at March 31, 2018		4,130,194	$	9.60

- 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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