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Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination [Line Items]      
Income tax (benefit) expense $ (85) $ 287 $ 35
Federal tax rate 34.00%    
Deferred tax assets valuation allowance $ 13,309 15,250  
Valuation allowance increase (decrease) $ (1,900)    
Change in ownership percentage (more than) 50.00%    
Stockholder ownership (or greater) 5.00%    
Not Subject to Limitations      
Income Tax Examination [Line Items]      
Proceeds from sale of operating loss carryforward $ 23,100    
Subject to Limitations | Minimum      
Income Tax Examination [Line Items]      
Net operating losses 1,000    
Subject to Limitations | Maximum      
Income Tax Examination [Line Items]      
Net operating losses 2,300    
Alternative Minimum Tax Carryover      
Income Tax Examination [Line Items]      
U.S. TCJA recovery of alternative minimum tax credits $ 73 $ 0 $ 0