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Note 23 - Equity-settled Share-based Expense (Details Textual) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) | Jun. 26, 2017 | Jun. 23, 2017 USD ($) | May 30, 2017 USD ($) | Feb. 20, 2012 | Jul. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 22, 2017 | Oct. 19, 2016
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Option life, share options granted |  |  |  |  |  |  | 3 |  | 5 |  |  |  |
Share-based compensation arrangement, percentage of outstanding stock maximum |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Share consolidation ratio |  | 5 |  |  |  |  | 5 |  | 5 |  |  |  |
Weighted average remaining contractual life of outstanding share options |  |  |  |  |  |  | 3.72 |  | 3.08 |  | 2.46 |  |
Number of share options granted in share-based payment arrangement |  |  |  |  |  |  | 5,000 | [1] | 18,000 | [1] | 23,000 |  |
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets |  |  | $ 806,000 |  |  |  | $ 835,000 |  | $ 170,000 |  | $ 24,000 |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Borrowings, interest rate |  |  | 7.25% |  |  |  |  |  |  |  |  |  | 7.25%
Dividend loans, Percentage of dividend as payment of interest |  |  | 80.00% |  | 80.00% |  |  |  |  |  |  |  |
Liabilities from share-based payment transactions |  |  |  |  |  |  | 1,826,000 |  | 618,000 |  |  |  |
Expense from cash-settled share-based payment transactions included in production costs |  |  |  |  |  |  | 311,000 |  |  |  |  |  |
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets |  |  |  |  |  |  | $ 976,000 |  | $ 618,000 |  |  |  |
Faciliation and advanced dividend loans [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets |  |  | $ 806,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 7.25% |  |  |  |  |  |  |  |  |  |
Dividend loans, Percentage of dividend as payment of interest |  |  | 80.00% |  |  |  |  |  |  |  |  |  |
LIBOR [member] | Faciliation and advanced dividend loans [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Mr. J Staiger [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement |  |  |  | 5,000 |  |  |  |  |  |  |  |  |
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets |  |  |  | $ 29,000 |  |  |  |  |  |  |  |  |
Omnibus Equity Incetive Compensation Plan [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Option life, share options granted |  |  |  |  |  |  | 10 |  |  |  |  |  |
Rolling Stock Option Plan [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Option life, share options granted |  |  |  |  |  |  | 5 |  |  |  |  |  |
Restricted stock units (RSUs) [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of other equity instruments |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of other equity instruments granted in share-based payment arrangement |  |  |  |  |  |  | 88,494 |  | 80,234 |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted |  |  |  |  |  |  | $ 7.37 |  | $ 5.50 |  |  |  |
Performance share units (PSUs) [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of other equity instruments |  |  |  |  |  |  | 3 |  |  |  |  |  |
Performance probability |  |  |  |  |  |  | 94.00% |  |  |  |  |  |
Performance multiplier |  |  |  |  |  |  | 94.00% |  | 100.00% |  |  |  |
Liabilities from share-based payment transactions |  |  |  |  |  |  | $ 1,782,000 |  | $ 618,000 |  |  |  |
Expense from cash-settled share-based payment transactions included in production costs |  |  |  |  |  |  | $ 311,000 |  | $ 0 |  | 0 |  |
Number of other equity instruments granted in share-based payment arrangement |  |  |  |  |  |  | 324,694 |  | 306,920 |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted |  |  |  |  |  |  | $ 7.17 |  | $ 5.25 |  |  |  |
Cash-settled awards [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of other equity instruments |  |  |  |  |  | 3 |  |  |  |  |  |  |
Liabilities from share-based payment transactions |  |  |  |  |  |  | 44,000 |  | 0 |  | 0 |  |
Number of other equity instruments granted in share-based payment arrangement |  |  |  |  |  | 37,330 |  |  |  |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted | £ |  |  |  |  |  | £ 5.10 |  |  |  |  |  |  |
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets |  |  |  |  |  |  | $ 123,000 |  | $ 0 |  | $ 0 |  |
Number of other equity instruments exercised or vested in share-based payment arrangement | 12,447 |  |  |  |  |  |  |  |  |  |  |  |
Payments to and on behalf of employees | $ 79,000 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Amounts stated after the 1:5 share consolidation, refer note 19.

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