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Income taxes - Deferred income tax assets (liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax assets (liabilities) |  |
- Reserves for doubtful accounts | $ 497 | $ 500
- Inventory reserve | 687 | 1,045
- Non qualified stock options | 529 | 383
- Deferred interest |  | 2,637
- Accrued expenses | 82 | 107
Net deferred income tax assets | 1,795 | 4,672
- Depreciation & amortization | (6,353) | (4,916)
Total deferred tax assets | (6,353) | (4,916)
Net deferred income tax liabilities | $ (4,558) | $ (244)

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