Note 6 - Stock Warrants - Stock Warrant Activity (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Outstanding, shares (in shares) | shares	240,000
Outstanding, weighted-average exercise price per share (in dollars per share) | $ / shares	$ 0.125
Granted, shares (in shares) | shares
Granted, weighted-average exercise price per share (in dollars per share) | $ / shares
Exercised, shares (in shares) | shares
Exercised, weighted-average exercise price per share (in dollars per share) | $ / shares
Forfeited, shares (in shares) | shares
Forfeited, weighted-average exercise price per share (in dollars per share) | $ / shares
Expired, shares (in shares) | shares	(240,000)
Expired, weighted-average exercise price per share (in dollars per share) | $ / shares	$ 0.125
Outstanding, shares (in shares) | shares
Outstanding, weighted-average exercise price per share (in dollars per share) | $ / shares