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Note 8 - Options and Warrants to Purchase Common Stock (Tables)

3 Months Ended

Mar. 31, 2017

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

		Warrants Outstanding and Exercisable
Exercise Price		Number Outstanding		Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price
$	0.25		3,283,283		4.25	$	0.25
$	1.15		461,340		4.05	$	1.15
			3,744,623		4.25	$	0.36

Share-based Compensation, Stock Options, Activity [Table Text Block]

	March 31, 2017
			Weighted		Weighted Average
			Average		Remaining
	Shares		Exercise Price		Contractual Life*

Outstanding at beginning of period		21,277,479	$	0.87		4.26
Outstanding at end of period		21,277,479	$	0.87		4.19
Exercisable at end of period		20,540,796	$	0.88		4.11

- 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.

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