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Stockholders equity and dividend payment - Dividend payment (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 23, 2018
Aug. 31, 2018
May 30, 2018
Feb. 28, 2018
Dec. 06, 2017
Aug. 31, 2017
May 31, 2017
Feb. 22, 2017
Sep. 30, 2018
Dec. 31, 2017
Dividend Payment [Abstract]                    
Payment   $ 2,900,000 $ 2,900,000 $ 2,900,000 $ 2,800,000 $ 2,800,000 $ 10,100,000 $ 7,600,000    
Total Payment                 $ 8,600,000 $ 23,300,000
Per common share $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.08 $ 0.08 $ 0.06 $ 0.20