Note 11 - Warrants to Purchase Common Stock (Tables)

6 Months Ended

Jun. 30, 2016

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, 2015		78,462		$	29.55		3.43
Granted		66,666			2.50		2.00
Expired		(2,475	)		50.50		—
Outstanding at June 30, 2016		142,653		$	17.42		2.50
Exercisable at June 30, 2016		142,653		$	17.42		2.50