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Long-Term Debt (Narrative) (Details)
$ in Thousands
12 Months Ended
Mar. 21, 2018
USD ($)
Jan. 02, 2018
shares
Feb. 13, 2017
shares
Dec. 31, 2017
USD ($)
Mar. 28, 2018
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]            
Credit facility amount outstanding       $ 0   $ 2,400
Proceeds from rights offering       $ 2,699    
Subsequent Event [Member]            
Debt Instrument [Line Items]            
Credit facility amount outstanding         $ 0  
Prosperity Bank [Member]            
Debt Instrument [Line Items]            
Credit facility maturity date       Jul. 31, 2020    
Rate above prime       0.50%    
Credit facility maximum borrowing capacity       $ 50,000    
Credit facility current borrowing capacity       $ 1,250    
Prosperity Bank [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Interest rate 5.00%          
Credit facility current borrowing capacity $ 2,000          
Maximum [Member] | Prosperity Bank [Member]            
Debt Instrument [Line Items]            
Funded debt to EBITDA       3.5    
Minimum [Member] | Prosperity Bank [Member]            
Debt Instrument [Line Items]            
Current ratio       1    
Interest coverage       3.0    
Rights [Member]            
Debt Instrument [Line Items]            
Common stock, New shares issued | shares     4,498,698      
Directors, CFO And Interim CEO [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Common stock, New shares issued | shares   4,569        
Directors, Management, And Affiliates [Member] | Rights [Member]            
Debt Instrument [Line Items]            
Common stock, New shares issued | shares     3,293,407