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Income Taxes - Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Deferred tax assets    
Net operating loss carryforward $ 2,826 $ 2,416
Capital loss carryover 976 739
GAAP/Tax basis differences 4,056 3,903
Total deferred tax assets 7,858 7,058
Deferred tax liabilities    
Deferred tax liabilities 7 6
Valuation allowance (6,949) (6,069)
Total net deferred tax asset $ 902 $ 983