Note 12 - Common stock warrants: Schedule of Series B and Series D common stock warrants (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Series B
Warrants Outstanding, Starting Balance	4,500	4,500
Warrants Issued	0	0
Warrants Exercised	(4,500)	0
Warrants Outstanding, Ending Balance	0	4,500
Series D
Warrants Outstanding, Starting Balance	8,206,390	12,709,736
Warrants Issued	0	0
Warrants Exercised	(1,540,383)	(4,503,346)
Warrants Outstanding, Ending Balance	6,666,007	8,206,390
B and D Total
Warrants Outstanding, Starting Balance	8,210,890	12,714,236
Warrants Issued	0	0
Warrants Exercised	(1,544,883)	(4,503,346)
Warrants Outstanding, Ending Balance	6,666,007	8,210,890