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Income taxes (Details - Deferred tax assets) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax liabilities attributable to:    
Accumulated depreciation and amortization $ (3,394) $ (3,401)
Unrealized gains (472) (473)
Total deferred tax liabilities (3,866) (3,874)
Deferred tax assets attributable to:    
Net operating losses 6 6
Accrued compensation 287 170
Incentive compensation 194 164
Inventory 328 324
Allowances for doubtful accounts and discounts 5 5
Deferred revenue 0 10
Other 17 (6)
Total net deferred tax assets 837 673
Net deferred tax liabilities $ (3,029) $ (3,201)