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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 250 | $ 212
Accruals and reserves | 1,768 | 1,902
Other | 218 | 399
Total deferred tax assets | 2,236 | 2,513
Deferred tax liabilities: |  |
Property, plant, and equipment | 6,375 | 5,926
Other | 5 | 3
Total deferred tax liabilities | 6,380 | 5,929
Valuation Allowance | 0 | 0
Net deferred tax asset/(liability) | $ (4,144) | $ (3,416)

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