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Income taxes - Elements of Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Deferred income tax assets (liabilities) |  |  |  |
- Depreciation & amortization | $ (6,365) | $ (7,424) |  |
- Reserves for doubtful accounts | 398 | 324 |  |
- Inventory reserve | 977 | 1,408 |  |
- Non qualified stock options | 612 | 1,219 |  |
- Net operating losses | 7,270 | 11,963 |  |
- AMT credit | 0 | 0 |  |
- Deferred interest | 10,381 | 10,114 |  |
- Deferred bonus | 0 | 74 |  |
- Accrued Expenses | 184 | 0 |  |
- Valuation allowance | (15,149) | (19,033) | $ (19,000) | $ (11,300)
Total | $ (1,692) | $ (1,355) |  |

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