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Subsequent events (Details Text) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 03, 2019
Nov. 14, 2019
Aug. 29, 2019
May 28, 2019
Feb. 26, 2019
Nov. 23, 2018
Aug. 31, 2018
May 30, 2018
Feb. 28, 2018
Sep. 30, 2019
Dec. 30, 2018
Oct. 16, 2019
Dividend Payment                        
Per common share   $ 0.05 $ 0.02 $ 0.08 $ 0.05 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.15 $ 0.08  
Nordea Credit Facility [Member]                        
Debt prepayments                        
Prepayments of lines of credit                       $ 35,000,000
Convertible notes due 2019 [Member]                        
Conversion of Convertible Notes                        
Conversion of Stock, Amount Converted $ 26,434,000                      
Conversion price per share $ 6.0216                      
Shares issued 4,389,858                      
Remaining in aggregate principal amount repaid in cash $ 6,426,000