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10. Income taxes (Details - Deferred tax assets) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax liabilities attributable to:    
Accumulated depreciation and amortization $ (2,015) $ (2,062)
Unrealized gains (465) 0
Total deferred tax liabilities (2,480) (2,062)
Deferred tax assets attributable to:    
Net operating losses 507 595
Capital loss carry-forward & investment impairment 0 115
Accrued compensation 89 0
Incentive compensation 473 448
Inventory 312 355
Allowances for doubtful accounts and discounts 115 109
Deferred revenue 40 0
Other 22 50
Total net deferred tax assets 1,558 1,672
Net deferred tax liabilities $ (922) $ (390)