Note 9 - Stockholder's Equity (Tables)

12 Months Ended

Dec. 31, 2015

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

Issue Date	Number of Underlying Shares of Common Stock		Per Share Exercise Price		Expiration Date
February 2, 2011		2,000		100.00	February 2, 2016
February 23, 2011		1,500		100.00	February 23, 2016
March 15, 2011		1,200		100.00	March 15, 2016
April 6, 2011		2,000		100.00	April 6, 2016
April 15, 2011		1,200		100.00	April 15, 2016
April 26, 2011		2,500		100.00	April 26, 2016
April 29, 2011		3,000		100.00	April 29, 2016
June 26, 2011		104,057		65.00	June 26, 2016
June 26, 2011		52,028		100.00	June 26, 2016
July 1, 2011		5,300		65.00	July 1, 2016
May 23, 2012		30,000		30.00	May 23, 2017
July 1, 2012		10,000		75.00	July 1, 2017
August 20, 2012		90,000		38.00	August 20, 2017
March 27, 2013		173,917		3.00	March 27, 2018
March 17, 2014		15,000		4.90	March 17, 2019
April 29, 2014		832,950		4.80	April 29, 2018
April 29, 2014		277,650		4.80	April 29, 2018
April 29, 2014		35,000		4.80	April 29, 2018
April 29, 2014		351,060		2.00	April 29, 2018
May 6, 2014		1,025,438		4.80	May 6, 2018
May 6, 2014		341,813		4.80	May 6, 2018
May 21, 2014		261,693		4.80	May 21, 2018
May 21, 2014		89,731		4.80	May 21, 2018
June 13, 2014		533,625		4.80	June 13, 2018
June 13, 2014		177,875		4.80	June 13, 2018
June 13, 2014		16,037		4.80	June 13, 2018
July 10, 2014		15,000		4.80	July 10, 2018
July 10, 2014		5,000		4.80	July 10, 2018
October 21, 2014		75,000		4.80	October 21, 2018
December 8, 2014		250,000		3.75	December 8, 2019
		4,781,574

Schedule of Warrant Valuation Assumptions [Table Text Block]

	2014

Risk-free interest rate	1.11	–	1.67%
Expected life in years	4.0	–	5.0
Expected volatility	64%	-	66%
Expected dividend yield		—

- 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