Note 9 - Stockholders' Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Outstanding and exercisable, Number of Options, Balance (in shares)		520,000
Outstanding and exercisable, Balance (in dollars per share)		$ 0.15
Exercised, Number of Options (in shares)		(515,000)
Exercised, Weighted Average Exercise Price (in dollars per share)		$ (0.15)
Expired, Number of Options (in shares)		(5,000)
Expired, Weighted Average Exercise Price (in dollars per share)		$ (0.15)
Outstanding and exercisable, Number of Options, Balance (in shares)	1,010,000
Outstanding and exercisable, Balance (in dollars per share)	$ 0.42
Granted, Number of Options (in shares)	1,010,000	0
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.42	$ 0