Note 15 - Common stock warrants: Schedule of Series E, F, G and H warrants (Details) - Series H $7.00 exercise price - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Warrants Outstanding, Starting Balance	689,159	689,159
Warrants Issued	0	0
Warrants Exercised	0	0
Warrants Outstanding, Ending Balance	689,159	689,159