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Deferred Income Taxes - Schedule of Change in Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets    
Deferred tax assets beginning balance $ 7,606 $ 11,957
Credited (charged) to statement of (loss) income 1,993 (4,351)
Deferred tax assets Ending balance 9,599 7,606
Deferred tax liabilities:    
Deferred tax liabilities beginning balance (12,431) (16,944)
Credited (charged) to statement of income (loss) 912 4,242
Charged to statements of other comprehensive (loss) income   271
Deferred tax liabilities Ending balance (11,519) (12,431)
Tax losses/other credits [member]    
Deferred tax assets    
Deferred tax assets beginning balance 5,124 7,413
Credited (charged) to statement of (loss) income 1,053 (2,289)
Deferred tax assets Ending balance 6,177 5,124
LT Debt/Interest [member]    
Deferred tax assets    
Deferred tax assets beginning balance 2,222 3,190
Credited (charged) to statement of (loss) income 524 (968)
Deferred tax assets Ending balance 2,746 2,222
Inventory [member]    
Deferred tax assets    
Deferred tax assets beginning balance 374 518
Credited (charged) to statement of (loss) income 133 (144)
Deferred tax assets Ending balance 507 374
Intangibles [member]    
Deferred tax assets    
Deferred tax assets beginning balance   399
Credited (charged) to statement of (loss) income   (399)
Other [member]    
Deferred tax assets    
Deferred tax assets beginning balance (114) 437
Credited (charged) to statement of (loss) income 283 (551)
Deferred tax assets Ending balance 169 (114)
Accelerated tax depreciation [member]    
Deferred tax liabilities:    
Deferred tax liabilities beginning balance (9,026) (15,205)
Credited (charged) to statement of income (loss) 567 6,179
Deferred tax liabilities Ending balance (8,459) (9,026)
Biological asset [member]    
Deferred tax liabilities:    
Deferred tax liabilities beginning balance (460) (674)
Credited (charged) to statement of income (loss) 175 214
Deferred tax liabilities Ending balance (285) (460)
Revaluation surplus [member]    
Deferred tax liabilities:    
Deferred tax liabilities beginning balance (794) (1,065)
Charged to statements of other comprehensive (loss) income   271
Deferred tax liabilities Ending balance (794) (794)
Joint venture shares [member]    
Deferred tax liabilities:    
Deferred tax liabilities beginning balance (2,151)  
Credited (charged) to statement of income (loss) 170 (2,151)
Deferred tax liabilities Ending balance $ (1,981) $ (2,151)