Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

Warrants (Details)	3 Months Ended
Warrants (Details)	Mar. 31, 2015
Outstanding, Beginning	26,769
Warrants exercised	(14,189)
Outstanding, End of period	12,580
January 2012 warrants [Member]
Outstanding, Beginning	650
Warrants exercised
Outstanding, End of period	650
Expiration date	Jan. 11, 2016
February 2012 warrants [Member]
Outstanding, Beginning	455
Warrants exercised
Outstanding, End of period	455
Expiration date	Mar. 01, 2016
June 2013 (A) warrants [Member]
Outstanding, Beginning	1,864
Warrants exercised	(564)
Outstanding, End of period	1,300
Expiration date	Apr. 25, 2018
June 2013 (B) warrants [Member]
Outstanding, Beginning	1,000
Warrants exercised
Outstanding, End of period	1,000
Expiration date	Feb. 28, 2016
August 2013 warrants [Member]
Outstanding, Beginning	10,000
Warrants exercised	(7,000)
Outstanding, End of period	3,000
Expiration date	Aug. 26, 2023
October 2013 warrants [Member]
Outstanding, Beginning	200
Warrants exercised	(200)
Outstanding, End of period
Expiration date	Oct. 18, 2018
Series A 2013 warrants [Member]
Outstanding, Beginning	7,100
Warrants exercised	(6,125)
Outstanding, End of period	975
Expiration date	Oct. 24, 2023
January 2014 warrants [Member]
Outstanding, Beginning	5,500
Warrants exercised	(300)
Outstanding, End of period	5,200
Expiration date	Jan. 16, 2024