REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract]
Total Accounts Receivable	$ 6,060	$ 6,034
Total Deferred Revenue	1,224	1,256
Regulated Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Accounts Receivable	5,756	5,631
Contract Assets	2,771	2,397
Total Deferred Revenue	1,003	1,053
Refund Liability	1,548	0
Deferred Revenue	1,100
Non-Regulated Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Accounts Receivable	304	403
Total Deferred Revenue	221	$ 203
Deferred Revenue	$ 180

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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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.

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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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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer.

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