Note 5 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Outside of 2007 Plan [Member]

Notes Tables

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

							Weighted
Balance, September 30, 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		1,893,434		0.34	–	0.36		0.35
Expired		(46,250	)		0.30			0.30
Plan classification		(600,000	)	0.30	–	0.63		0.33
Balance, September 30, 2015		19,212,474		$0.18	–	1.00	$	0.44

							Weighted
							Average
Balance, September 30, 2016:	Options			Exercise			Price per
	Outstanding			Price per share			share
Balance, December 31, 2015		19,394,975		$0.18	–	1.00	$	0.40
Granted		906,973		0.33	–	0.76	$	0.48
Exercised		(60,000	)		0.25			0.25
Balance, September 30, 2016		20,241,948		$0.18	–	1.00	$	0.41

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

									Weighted
Balance, September 30, 2015:						Exercise			Average
	Options		Shares			Price			Price per
	Outstanding		Available			per share			share
Balances as of December 31, 2014		8,601,086		3,398,914		$0.23	–	1.89	$	0.44
Granted		1,040,000		(1,040,000	)	0.30	–	0.58		0.35
Plan classification		600,000		(600,000	)	0.30	–	0.60		0.33
Balance, September 30, 2015		10,241,086		2,158,914		$0.23	–	1.89	$	0.43

										Weighted
							Exercise			Average
Balance, September 30, 2016:	Options			Shares			Price			Price per
	Outstanding			Available			per share			share
Balances as of December 31, 2015		10,241,086			1,758,914		$0.22	–	1.89	$	0.44
Granted		40,000			(40,000	)		0.45			0.45
Cancelled		(262,500	)		262,500			0.40			0.40
Balance, September 30, 2016		10,018,586			1,981,414		$0.22	–	1.89	$	0.46

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	1.83	–	2.33%	1.60	–	2.38%	1.77	–	2.27%	1.36	–	1.77%
Expected volatility	794	–	821%	322	–	807%	641	–	738%	315	–	641%
Expected dividend yield		–			–			–			–
Forfeiture rate		–			–			–			–
Life in years		7		3	–	7		7			5