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9. Income taxes (Details - Deferred tax assets) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities attributable to:    
Accumulated depreciation and amortization $ (1,784) $ (1,854)
Total net deferred tax liabilities (1,784) (1,854)
Deferred tax assets attributable to:    
Net operating losses 14 0
Capital loss carry-forward & investment impairment 122 166
Incentive compensation 255 126
Inventory 335 331
Allowances for doubtful accounts and discounts 161 39
Other 57 0
Total net deferred tax assets 944 662
Net deferred tax liabilities $ (840) $ (1,192)