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Income Taxes - Deferred tax assets (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets |  |
Net operating loss carryforwards | $ 535,000 | $ 4,928,000
Interest limitation carryforwards | 1,033,000 | 686,000
Accrued liabilities | 391,000 | 477,000
Accounts receivable | 40,000 | 108,000
Inventory | 322,000 | 587,000
Property, plant, and equipment | (5,509,000) | (5,580,000)
Post retirement benefits | 2,068,000 | 2,090,000
Goodwill and finite-lived assets, net | 2,210,000 | 1,973,000
Other, net | 156,000 | 24,000
Total Deferred Tax Assets | 1,246,000 | 5,293,000
Valuation allowance for deferred tax assets | (1,193,000) | (3,267,000)
Total deferred tax asset, net | $ 53,000 | $ 2,026,000

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