INCOME TAXES - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Non-current Deferred Tax Asset (Liability)
Accumulated net operating losses of TRS	$ 337	$ 758
Unrealized gain (loss)	251	127
Capitalized transaction costs	122	196
Deferred income	57	77
AMT Credit	19	12
Deferred tax asset	786	1,170
Valuation allowance	(767)	(1,170)
Net non-current deferred tax asset (liability)	$ 19	$ 0