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Income taxes (Details - Deferred tax assets) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax liabilities attributable to: |  |
Accumulated depreciation and amortization | $ (3,401) | $ (3,281)
Unrealized gains | (473) | (467)
Total deferred tax liabilities | (3,874) | (3,748)
Deferred tax assets attributable to: |  |
Net operating losses | 6 | 6
Accrued compensation | 170 | 149
Incentive compensation | 164 | 168
Inventory | 324 | 323
Allowances for doubtful accounts and discounts | 5 | 109
Deferred revenue | 10 | 15
Other | (6) | 34
Total net deferred tax assets | 673 | 804
Net deferred tax liabilities | $ (3,201) | $ (2,944)

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