Note 6 - Stockholders' Equity (Deficiency) - Stock Option Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Outstanding, number of options, balance (in shares)	1,605,000	1,010,000
Outstanding, weighted average exercise price, balance (in dollars per share)	$ 0.42	$ 0.42
Granted, number of options (in shares)	2,130,000	725,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0.47	$ 0.42
Exercised, number of options (in shares)
Exercised, weighted average exercise price (in dollars per share)
Cancelled, number of options (in shares)	(125,000)	(130,000)
Cancelled, weighted average exercise price (in dollars per share)	$ (0.42)	$ (0.42)
Outstanding, number of options, balance (in shares)	3,610,000	1,605,000
Outstanding, weighted average exercise price, balance (in dollars per share)	$ 0.45	$ 0.42