Note 12 - Stockholders' (Deficit) - Warrants (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Number outstanding (in shares)	26,020,000	27,020,000	27,860,000
Weighted average remaining contractual life (Year)	1 year 54 days	1 year 306 days
Weighted average exercise price (in dollars per share)	$ 0.42	$ 0.42
Class of Warrant or Right, Exercisable (in shares)	26,020,000	27,020,000
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