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Salaries and other employee expenses (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 29, 2008
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Sharebased Payment Arrangements [Line Items]        
Restricted shares, charged against income   $ 306,000 $ 570,000 $ 739,000
Restricted shares to Directors   1,100,000 1,400,000 1,500,000
Cost pending amortization   $ 699,000    
Duration of amortization of restricted cash   2 years 3 months 29 days    
Vested shares, Fair value   $ 1,100,000 1,400,000 1,300,000
Amortization cost, Restricted shares   640,000 359,000 503,000
Balance outstanding, Restricted shares   583,000    
Weighted average fair value at measurement date, share options vested   $ 256,000 168,000 1,000,000
Expiration period   7 years    
Exercise rate of outstanding share options   25.00%    
Amortization cost charged against income   $ 14,000    
Intrinsic value, exercised options       406,000
Exercise price, share options granted       2,500,000
Wages and salaries   $ 13,717,000 $ 13,232,000 $ 18,487,000
Restricted Shares Amortization Over the Year   3.1 years    
Class E shares [Member]        
Disclosure Of Sharebased Payment Arrangements [Line Items]        
Description of lapse of restriction on shares   Restricted stock loses their restriction from the year following the anniversary date, as follows: 35% in the first and second years, and 30% in the third year.    
Percentage of vesting of restricted share   25.00%    
Number of shares issued     57,000 57,000
Number of Shares, Granted   63,000    
Key management personnel of entity or parent [member]        
Disclosure Of Sharebased Payment Arrangements [Line Items]        
Value of granted restricted share options   $ 902,000 $ 355,000 $ 581,000
Wages and salaries   75,000 87,000 102,000
Maximum | Key management personnel of entity or parent [member] | Class E shares [Member]        
Disclosure Of Sharebased Payment Arrangements [Line Items]        
Number Of Shares To Be Granted 3,000,000      
Restricted Stocks [Member]        
Disclosure Of Sharebased Payment Arrangements [Line Items]        
Fair value, Restricted shares granted   $ 727,000 $ 1,300,000 $ 1,600,000
Restricted Stocks [Member] | Key management personnel of entity or parent [member]        
Disclosure Of Sharebased Payment Arrangements [Line Items]        
Number of Shares, Granted   51,829 23,743 23,412
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%