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INCOME TAXES AND TAX CREDIT TRANSACTIONS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Accruals for tax uncertainties | $ 0 | $ 0 |
Deferred income tax expense (benefit) | 0 | 100,000 | $ 300,000
Current income tax expense (benefit) | $ (200,000) | $ (100,000) | $ 100,000

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