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Income taxes (Details - Deferred tax assets) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax liabilities attributable to:    
Accumulated depreciation and amortization $ (3,829) $ (3,519)
Unrealized gains (467) (469)
Total deferred tax liabilities (4,296) (3,988)
Deferred tax assets attributable to:    
Net operating losses 6 6
Accrued compensation 454 403
Incentive compensation 499 301
Inventory 279 280
Allowances for doubtful accounts and discounts 2 3
Other (6) (6)
Total net deferred tax assets 1,234 987
Net deferred tax liabilities $ (3,062) $ (3,001)