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Stock options (Details 1) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock options, Outstanding 1,154,167 6,250 6,250
$0.15 - $3.12 [Member]      
Weighted Average Remaining Contractual Life 1 year 5 months 1 day    
Weighted-Average Exercise Price $ 0.21    
Number Exercisable 1,154,167    
Weighted-Average Exercise Price $ 0.21