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REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Contract with Customer, Asset and Liability [Abstract]
Total Deferred Revenue	$ 1,331	$ 1,514
Tariff Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Contract Assets	2,424	2,144
Total Deferred Revenue	1,085	1,227
Tariff Deferred Revenue	1,200
Non-Tariff Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Deferred Revenue	246	$ 287
Tariff Deferred Revenue	$ 300

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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