Note 6 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

	2017						2018
	Non Plan			2007 Plan			Non Plan
Risk free interest rate		2.40	%		2.40	%		2.43	%
Expected volatility		601	%		601	%		563	%
Expected dividend yield		—			—			—
Forfeiture rate		—			—			—
Expected life in years		7			7			7

Outside of 2007 Plan [Member]

Notes Tables

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

							Weighted
							Average
As of March 31, 2017 :	Options		Exercise				Price per
	Outstanding		Price per share				share
Balance, December 31, 2016		20,148,766	$	0.18	–	1.00	$	0.40
Granted		583,526		0.50	–	0.67		0.59
Expired		—			—			—
Balance, March 31, 2017		20,732,292	$	0.18	–	1.00	$	0.41

								Weighted
								Average
As of March 31, 2018 :	Options			Exercise				Price per
	Outstanding			Price per share				share
Balance, December 31, 2017		20,018,408		$	0.25	–	1.00	$	0.51
Granted		619,435			0.26	–	0.28		0.26
Expired		(2,400,000	)			0.99			0.99
Balance, March 31, 2018		18,237,843		$	0.25	–	1.00	$	0.45

The 2007 Equity Incentive Plan [Member]

Notes Tables

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

							Weighted
							Average
As of March 31, 2017:	Options		Exercise				Price per
	Outstanding		Price per share				share
Balance, December 31, 2016		9,916,586	$	0.23	–	1.89	$	0.44
Granted		300,000			0.69			0.69
Expired		—			—			—
Balance, March 31, 2017		10,216,586	$	0.23	–	1.89	$	0.47

								Weighted
								Average
As of March 31, 2018:	Options				Exercise			Price per
	Outstanding				Price per share			share
Balance, December 31, 2017		9,831,586		$	0.23	–	1.89	$	0.44
Granted		—				—			—
Expired		(50,000	)			1.89			1.89
Balance, March 31, 2018		9,781,586		$	0.23	–	1.65	$	0.43