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REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Contract with Customer, Asset and Liability [Abstract] |  |
Total Deferred Revenue | $ 1,450 | $ 1,301
Tariff Revenue [Member] |  |
Contract with Customer, Asset and Liability [Abstract] |  |
Contract Assets | 2,175 | 2,146
Total Deferred Revenue | 1,150 | 1,050
Tariff Deferred Revenue | 1,100 |
Non-Tariff Revenue [Member] |  |
Contract with Customer, Asset and Liability [Abstract] |  |
Total Deferred Revenue | 300 | $ 251
Tariff Deferred Revenue | $ 200 |

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