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Cash and stock-based compensation plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Sharebased Payment Arrangements [Line Items]      
Fair value, Restricted shares granted $ 1,585,000 $ 1,376,000  
Restricted shares, charged against income 788,000 617,000  
Restricted shares to Directors 1,697,000 1,548,000 $ 1,553,000
Cost pending amortization 1,033,000    
Duration of amortisation of restricted cash 2.3    
Vested shares, Fair value 1,765,000 1,625,000  
Amortization cost, Restricted shares 811,000 1,295,000 1,282,000
Balance outstanding, Restricted shares 381,000    
Weighted average fair value at measurement date, share options vested $ 1,394,000 1,230,000  
Exercise rate of outstanding share options 25.00%    
Amortisation cost charged against income $ 118,000 251,000 454,000
compensation cost pending amortization $ 30,000    
Period of amortisation 1.11 years    
Intrinsic value, exercised options $ 593,000 412,000  
Exercise price, share options granted 3,533,000 1,565,000  
Wages and salaries $ 16,191,000 16,132,000 15,500,000
Restricted Shares Amortization Over the Year 2.5 years    
share-based payment arrangements, Tranche one [Member] | Restricted Stocks [Member]      
Disclosure Of Sharebased Payment Arrangements [Line Items]      
Percent of award vesting rights for share-based payment arrangement 35.00%    
share-based payment arrangements, Tranche two [Member] | Restricted Stocks [Member]      
Disclosure Of Sharebased Payment Arrangements [Line Items]      
Percent of award vesting rights for share-based payment arrangement 35.00%    
share-based payment arrangements, Tranche three [Member] | Restricted Stocks [Member]      
Disclosure Of Sharebased Payment Arrangements [Line Items]      
Percent of award vesting rights for share-based payment arrangement 30.00%    
Key management personnel of entity or parent [member]      
Disclosure Of Sharebased Payment Arrangements [Line Items]      
Value of granted restricted share options $ 650,000 1,670,000  
Wages and salaries $ 163,000 $ 121,000 $ 171,000
Class E shares [Member]      
Disclosure Of Sharebased Payment Arrangements [Line Items]      
Description of lapse of restriction on shares The stocks lose their restriction from the year following the anniversary date, as follows: 35% in the first and second year, and 30% in the third year.    
Percentage of vesting of restricted share 25.00%    
Number of shares issued 57,000 57,000 57,000