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INCOME TAXES - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Non-current Deferred Tax Asset (Liability)    
Accumulated net operating losses of TRS $ 137 $ 263
Unrealized gain (loss) 686 245
Capitalized transaction costs 120 112
Deferred tax asset 943 620
Valuation allowance 0 0
Net non-current deferred tax asset (liability) $ 943 $ 620