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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets (liabilities):        
Tax intangibles basis greater than book basis $ 1,101 $ 828    
Allowance for doubtful accounts 36 25    
Unearned income 469 225    
Federal and state net operating losses 13,344 13,526    
Capital Loss Carryforward 192 0    
Other (4) 101    
Accrued expenses 659 511    
Tax property basis greater than book basis (2,910) 1,320    
Prepaid expenses (2,377) (2,360)    
Net deferred tax asset 10,510 14,176    
Valuation allowance (11,581) (14,483) $ (15,422) $ (26,968)
Net deferred tax asset (liability) $ (1,071) $ (307)