REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract]
Total Accounts Receivable	$ 6,818	$ 6,034
Total Deferred Revenue	1,392	1,256
Regulated Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Accounts Receivable	6,499	5,631
Contract Assets	2,360	2,397
Total Deferred Revenue	1,140	1,053
Refund Liability	2,203	0
Deferred Revenue	1,100
Non-Regulated Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Accounts Receivable	319	403
Total Deferred Revenue	252	$ 203
Deferred Revenue	$ 183