Note 5 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

						Weighted
						Average		Aggregate
	Options		Exercise			Price per		intrinsic
	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

Balance, December 31, 2019	9,214,356		$0.22	–	0.43	$	0.25
Granted	1,343,344		0.17	–	0.22		0.18
Expired	—			—			—
Balance, March 31, 2020	10,557,700		$0.16	–	0.43	$	0.25
Non-vested	(4,677,385	)	0.17	–	0.45		0.27
Vested, March 31, 2020	5,880,315		$0.16	–	0.45	$	0.22	$	4,000

						Weighted
	Non-plan					a verage		Aggregate
	Options		Exercise			p rice per		intrinsic
As of March 31, 2019 :	o utstanding		p rice per share			share		value (1)
Balance, December 31, 2018		19,319,496	$0.25	–	1.00	$	0.51
Granted		731,250	0.16	–	0.25		0.19
Balance, March 31, 2019		20,050,746	$0.25	–	1.00	$	0.45	$	—

As of March 31, 2020 :
Balance, December 31, 2019	19,888,718		$0.23	–	1.00	$	0.41
Granted	292,437		0.17	–	0.21		0.18
Balance, March 31, 2020	20,181,155		$0.17	–	1.00	$	0.41
Non-vested	(3,191,096	)	0.17	–	0.45		0.45
Vested, March 31, 2020	16,989,249		$0.23	–	1.00	$	0.40	$	5,000

The 2007 Equity Incentive Plan [Member]

Notes Tables

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

							Weighted
							Average		Aggregate
	Options			Exercise			Price per		intrinsic
	Outstanding			price per share			share		Value (1)
Balance, December 31, 2018		9,831,586		$0.23	–	1.89	$	0.44
Expired		(50,000	)		1.89			0.91
Balance, March 31, 2019		9,781,586		$0.23	–	1.65	$	0.43	$	—

Balance, December 31, 2019	9,691,586		$0.23	–	0.94	$	0.42
Expired	(870,000	)		0.57			0.57
Balance, March 31, 2020	8,821,586		$0.23	–	1.65	$	0.41	$	—