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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

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