Note 9 - Warrants to Purchase Common Stock (Tables)

12 Months Ended

Dec. 31, 2015

Note 9 - Warrants To Purchase Common Stock

Summary of warrants issued, exercised and expired

A summary of warrants issued, exercised and expired are as follows:

	Shares			Weighted- Average Exercise Price ($)		Weighted-Average Remaining Contractual Term
Outstanding at December 31, 2013		103,823		$	101		1.36
Granted		70,753			29.29		4.41
Expired		(3,207	)		303		—
Outstanding at December 31, 2014		171,369		$	70.70		2.04
Granted		5,233			16.36		2.67
Expired		(98,140	)		100.81		—
Outstanding at December 31, 2015		78,462		$	29.55		3.43
Exercisable at December 31, 2015		78,462		$	29.55		3.43