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Note 10 - Warrant Liability (Tables)

3 Months Ended

Mar. 31, 2017

Schedule of Derivative Instruments [Table Text Block]

	Period Ended
Assumption	March 31, 2017			December 31, 2016
Expected price volatility		103.00	%		102.00	%
Expected term (in years)		2.93			3.18
Risk-free interest rate		1.48	%		1.51	%
Dividend yield		0.00	%		0.00	%
Weighted-average fair value of warrants	$	2.97		$	2.55

	Period Ended
Assumption	March 31, 2017			December 31, 2016
Expected price volatility		103.00	%		102.00	%
Expected term (in years)		2.93			3.18
Risk-free interest rate		1.48	%		1.51	%
Dividend yield		0.00	%		0.00	%
Weighted-average fair value of warrants	$	2.97		$	2.47

	Period Ended
Assumption	March 31, 2017			December 31, 2016
Expected price volatility		103.00	%		102.00	%
Expected term (in years)		2.93			3.18
Risk-free interest rate		1.48	%		1.51	%
Dividend yield		0.00	%		0.00	%
Weighted-average fair value of warrants	$	2.80		$	2.55

	Period Ended
Assumption	March 31, 2017			December 31, 2016
Expected price volatility		98.00	%		96.00	%
Expected term (in years)		3.58			3.83
Risk-free interest rate		1.62	%		1.66	%
Dividend yield		0.00	%		0.00	%
Weighted-average fair value of warrants	$	3.05		$	2.60

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

(in thousands, except for exercise price)	Warrants		Weighted- Average Exercise Price
Warrants outstanding December 31, 2016		565	$	1.81
Warrants granted		—		—
Warrants exercised		—		—
Warrants expired		—		—
Warrants outstanding March 31, 2017		565	$	1.81

July 2011, Long-term, Short-term, and October 2015 Warrants [Member]

Notes Tables

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

Shares and dollars in thousands	Shares		Warrant Liability
July 2011 Warrants		49	$	147
Long-Term Warrants		105		312
Short-Term Warrants		127		354
October 2015 Warrants		284		868
		565	$	1,681

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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-Publisher FASB
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-Topic 815
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-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 1
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

- 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.

+ References + Details