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REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Contract with Customer, Asset and Liability [Abstract] |  |
Total Deferred Revenue | $ 1,572 | $ 1,450
Tariff Revenue [Member] |  |
Contract with Customer, Asset and Liability [Abstract] |  |
Contract Assets | 2,801 | 2,175
Total Deferred Revenue | 1,193 | 1,150
Tariff Deferred Revenue | 1,200 |
Non-Tariff Revenue [Member] |  |
Contract with Customer, Asset and Liability [Abstract] |  |
Total Deferred Revenue | 379 | $ 300
Tariff Deferred Revenue | $ 300 |

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