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Note 9 - Dividends Distribution (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Nov. 22, 2017
Nov. 01, 2017
May 24, 2017
Nov. 23, 2016
May 25, 2016
Nov. 25, 2015
May 20, 2015
Nov. 27, 2014
May 25, 2016
May 20, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 03, 2017
May 04, 2016
May 06, 2015
Statement Line Items [Line Items]                                
Dividends recognised as distributions to owners per share   $ 0.13                            
Dividends payable, amount per ads   $ 0.26                            
Dividends recognised as distributions to owners $ 153,000   $ 484,000           $ 531,200 $ 531,200 $ 508,020 $ 536,720 $ 534,192      
Dividends payable, amount per share including interim dividend                           $ 0.41 $ 0.45 $ 0.45
Dividends payable, amount per ads including interim dividend                           $ 0.82 $ 0.90 $ 0.90
Dividends paid, ordinary shares per share $ 0.13   $ 0.28 $ 0.13 $ 0.30 $ 0.15 $ 0.30 $ 0.15                
Dividends paid, per ads $ 0.26   $ 0.56 $ 0.26 $ 0.60 $ 0.30 $ 0.60 $ 0.30