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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Allowance for doubtful accounts $ 212 $ 213
Accruals and reserves 1,902 1,963
Other 399 811
Total deferred tax assets 2,513 2,987
Deferred tax liabilities:    
Property, plant, and equipment 5,926 4,686
Other 3 1
Total deferred tax liabilities 5,929 4,687
Valuation Allowance
Net deferred tax asset/(liability) $ (3,416) $ (1,700)