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Income taxes - Deferred income tax assets (liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred income tax assets (liabilities): |  |
- Reserve for credit losses | $ 271 | $ 497
- Inventory reserve | 1,504 | 687
- Non qualified stock options | 796 | 529
- NOL | 112 |
- Accrued expenses | 202 | 82
Total Deferred income tax assets | 2,885 | 1,795
- Depreciation & amortization | (6,961) | (6,353)
Total deferred tax liabilities | (6,961) | (6,353)
Net deferred tax liabilities | $ (4,076) | $ (4,558)

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