Note 5 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

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, 2020		18,865,525		$0.16	–	0.40	$	0.19
Granted		2,483,691		0.13	–	0.23		0.19
Expired		—			—			—
Balance, June 30, 2021		21,349,216		$0.12	–	0.43	$	0.19
Non-vested		(4,218,833	)	0.12	–	0.40		0.23
Vested, June 30, 2021		17,130,383		$0.12	–	0.43	$	0.18	$	250,000
Balance, December 31, 2019		9,214,356		$0.16	–	0.43	$	0.25
Granted		8,610,689		0.17	–	0.22		0.19
Expired		(200,000	)	0.18	–	0.34		0.26
Balance, June 30, 2020		17,625,045		$0.16	–	0.43	$	0.20

							Weighted
							Average		Aggregate
	Options			Exercise			Price per		intrinsic
	Outstanding			price per share			share		Value(1)
Balance, December 31, 2020		5,689,363		$0.23	-	0.94	$	0.44
Expired		(1,453,855	)	0.39	-	0.51		0.40
Balance, June 30, 2021		4,235,508		$0.23	-	1.65	$	0.45	$	—
Balance, December 31, 2019		8,769,451		$0.23	–	0.94	$	0.42
Expired		(930,000	)	0.39	–	0.58		0.56
Balance, June 30, 2020		7,839,451		$0.23	–	1.65	$	0.41

							Weighted
	Non-plan						average		Aggregate
	Options			Exercise			price per		Intrinsic
	outstanding			price per share			share		value(1)
Balance, December 31, 2020		20,749,583		$0.17	–	1.00	$	0.41
Granted		43,956			0.23			0.23
Balance, June 30, 2021		20,793,539		$0.17	–	1.00	$	0.41
Non-vested		(1,996,576	)	0.17	–	0.45		0.45
Vested, June 30, 2021		18,796,963		$0.17	–	1.00	$	0.41	$	28,000
Balance, December 31, 2019		19,604,107		$0.23	–	1.00	$	0.41
Granted		292,437		0.17	–	0.21		0.18
Balance, June 30, 2020		19,896,544		$0.17	–	1.00	$	0.41