REVENUE RECOGNITION, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]
Total Deferred Revenue	$ 1,301		$ 1,252
Refund Liability		$ 3,800
Tariff Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Contract Assets	2,146		2,367
Total Deferred Revenue	1,050		1,025
Refund Liability	0		3,298
Tariff Deferred Revenue	1,000
Non-Tariff Revenue [Member]
Contract with Customer, Asset and Liability [Abstract]
Total Deferred Revenue	251		$ 227
Tariff Deferred Revenue	$ 200