Note 8 - Stockholders' Equity (Deficiency) - Summary of Information Concerning Outstanding and Exercisable Stock Options (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Number of outstanding (in shares)	3,575,000
Number of exercisable (in shares)	3,273,550
Range 1 [Member]
Range of exercise prices per share (in dollars per share) | $ / shares	$ 0.42
Number of outstanding (in shares)	855,000
Number of exercisable (in shares)	855,000
Expiry date	Dec. 20, 2021
Range 2 [Member]
Range of exercise prices per share (in dollars per share) | $ / shares	$ 0.42
Number of outstanding (in shares)	615,000
Number of exercisable (in shares)	421,550
Expiry date	Nov. 08, 2022
Range 3 [Member]
Range of exercise prices per share (in dollars per share) | $ / shares	$ 0.42
Number of outstanding (in shares)	830,000
Number of exercisable (in shares)	722,000
Expiry date	Jun. 04, 2023
Range 4 [Member]
Range of exercise prices per share (in dollars per share) | $ / shares	$ 0.50
Number of outstanding (in shares)	1,275,000
Number of exercisable (in shares)	1,275,000
Expiry date	Jun. 04, 2023