Note 12 - Stockholders' (Deficit) - Warrants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number outstanding (in shares)	27,020,000	27,860,000	22,900,000
Weighted average remaining contractual life (Year)	1 year 306 days	2 years 259 days
Weighted average exercise price (in dollars per share)	$ 0.42	$ 0.42
Class of Warrant or Right, Exercisable (in shares)	27,020,000	27,860,000
Warrants exercisable, weighted average exercise price (in dollars per share)	$ 0.42	$ 0.42
Minimum [Member]
Range of exercise price (in dollars per share)	0.25	0.25
Maximum [Member]
Range of exercise price (in dollars per share)	$ 0.60	$ 0.60