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Income taxes - Deferred income tax assets (liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Deferred income tax assets (liabilities) |  |  |  |  |
- Depreciation & amortization | $ (4,916) | $ (6,365) |  |  |
- Reserves for doubtful accounts | 500 | 398 |  |  |
- Inventory reserve | 1,045 | 977 |  |  |
- Non qualified stock options | 383 | 612 |  |  |
- Net operating losses |  | 7,270 |  |  |
- Deferred interest | 2,637 | 10,381 |  |  |
- Accrued expenses | 107 | 184 |  |  |
- Valuation allowance | (15,100) | (15,149) | $ (19,000) | $ (19,000) | $ (11,300)
Total | $ (244) | $ (1,692) |  |  |

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