Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Income (loss) per share) (Details)

v3.7.0.1
Significant accounting policies (Income (loss) per share) (Details) - shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 1,588,000 757,000
Private Placement [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 4,802,000  
Private Placement [Member] | Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 1,000,000  
Private Placement [Member] | Convertible Note [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in the computation of EPS 3,802,000