Note 7 - Warrants and Registration Rights Agreements (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	Shares Underlying Warrants			Weighted Average Exercise Price
Outstanding, December 31, 2018		20,140,731		$	0.15
Granted		500,000			0.76
Canceled / Expired		(500,000	)		0.76
Exercised		-			-
Outstanding, June 30, 2019		20,140,731		$	0.15