Note 5 - Warrants

6 Months Ended

Jun. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

5. Warrants

In connection with sales of the Company’s common stock, warrants were issued with exercise prices ranging from $1.60 to $5.00.  The warrants expire between one and seven years from the date of grant, subject to the terms applicable in the agreement.  As of June 30, 2013, the Company had warrants outstanding that are exercisable into 10,377,995 shares of common stock, with a weighted average exercise price of $2.76 per share. There was no warrant activity during six months ended June 30, 2013.