Note 5 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

Outside of 2007 Plan [Member]

Notes Tables

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

						Weighted
Balance, March 31, 2015:						Average
	Options		Exercise			Price per
	Outstanding		Price per share			share
Balance, December 31, 2014		17,965,291	$0.18	–	1.00	$	0.40
Granted		577,818		0.36			0.36
Expired		—		—			—
Balance, March 31, 2015		18,543,109	$0.18	–	1.00	$	0.40

						Weighted
						Average
Balance, March 31, 2016:	Options		Exercise			Price per
	Outstanding		Price per share			share
Balance, December 31, 2015		19,394,975	$0.18	–	1.00	$	0.40
Granted		263,523		$0.33		$	0.33
Expired		—		—			—
Balance, March 31, 2016		19,658,498	$0.18	–	1.00	$	0.40

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

									Weighted
Balance, March 31, 2015:									Average
	Options			Shares		Exercise			Price per
	Outstanding			Available		Price per share			share
Balances as of December 31, 2014		8,601,086			3,398,914	$0.23	–	1.89	$	0.44
Granted		—			—		—			—
Expired		(200,000	)		200,000		0.58			0.58
Balance, March 31, 2015		8,401,086			3,598,914	$0.23	–	1.89	$	0.43

								Weighted
								Average
Balance, March 31, 2016:	Options		Shares		Exercise			Price per
	Outstanding		Available		Price per share			share
Balances as of December 31, 2015		10,241,086		1,758,914	$0.22	–	1.89	$	0.44
Granted		—		—		—			—
Expired		—		—		—			—
Balance, March 31, 2016		10,241,086		1,758,914	$0.22	–	1.89	$	0.44

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2015					2016
	Non Plan			2007 Plan		Non Plan			2007 Plan
Risk free interest rate		1.97	%		—		1.91	%		1.36	%
Expected volatility		821	%		—		645	%		315	%
Expected dividend yield		—			—		—			—
Forfeiture rate		—			—		—			—
Expected life in years		7			—		7			5