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Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Expenses |  |
Salaries, wages, and commissions | $ 3,776 | $ 2,972
Taxes, other than income taxes | 133 | 406
Advances from customers | 298 | 153
Insurance | 702 | 578
Professional fees | 272 | 265
Warranty reserve | 233 | 11
Benefit plans | 238 | 242
Insurance financing liability | 0 | 668
Current portion, capital lease obligation |  | 39
Interest rate swap liability | 45 | 0
Customer rebate liability | 168 | 275
Other accrued items | 258 | 428
Accrued expenses and other current liabilities | $ 6,123 | $ 6,037

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