Note 7 - Warrants and Registration Rights Agreements (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Shares			Weighted Average
	Underlying			Exercise
	Warrants			Price
Outstanding, December 31, 2017		15,855,017		$	0.18
Granted		5,000,000			0.09
Canceled / Expired		(714,286	)		0.53
Exercised		-			-
Outstanding, December 31, 2018		20,140,731			0.15
Granted		500,000			0.76
Canceled / Expired		(8,829,082	)		0.14
Exercised		-			-
Outstanding, December 31, 2019		11,811,649			0.14