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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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