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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% |  |

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