Note 5 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted
						Average		Aggregate
	Options		Exercise			Price per		intrinsic
As of March 31, 2019 :	Outstanding		Price per share			share		Value (1)
Balance, December 31, 2018		1,318,517	$0.22	–	0.43	$	0.30
Granted		890,280	0.16	–	0.22		0.19
Expired		—		—			—
Balance, March 31, 2019		2,208,797	$0.16	–	0.43	$	0.25	$	—

								Weighted
								Average		Aggregate
	Options			Exercise				Price per		intrinsic
As of March 31, 2018 :	Outstanding			p rice per share				share		Value (1)
Balance, December 31, 2017		9,831,586			$0.23	–	1.89	$	0.44
Expired		(50,000	)			1.89			0.91
Balance, March 31, 2018		9,781,586			$0.23	–	1.65	$	0.43	$	—
As of March 31, 2019 :
Balance, December 31, 2018		9,691,586			$0.23	–	0.94	$	0.43
Expired		(30,000	)		0.38	–	0.70		0.50
Balance, March 31, 2019		9,661,586			$0.23	–	1.65	$	0.43	$	—

								Weighted
	Non-plan							a verage		Aggregate
	Options			Exercise				p rice per		intrinsic
As of March 31, 2018 :	o utstanding			p rice per share				share		value (1)
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	$	—
As of March 31, 2019 :
Balance, December 31, 2018		19,319,496			$0.23	–	1.00	$	0.43
Granted		731,250			0.16	–	0.25		0.19
Balance, March 31, 2019		20,050,746			$0.25	–	1.00	$	0.42	$	—