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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.