Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

v3.8.0.1
Commitments And Contingencies (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies [Line Items]      
Rent expense   $ 474,000 $ 620,000
(Income) expense for long-term compensation plan   (5,000) 16,000
Accrual for long-term compensation plans   11,000 16,000
Performance Units [Member]      
Commitments and Contingencies [Line Items]      
Award payouts, cash   $ 0 0
Mortgage [Member]      
Commitments and Contingencies [Line Items]      
Interest rate   6.83%  
Payment to settle mortgage $ 104,000    
Line of Credit [Member]      
Commitments and Contingencies [Line Items]      
Line of credit, amount outstanding   $ 0 $ 0
Line of credit, maximum borrowing capacity   15,000,000  
Line of credit, remaining borrowing capacity   $ 10,080,000  
Line of credit, basis spread on variable rate   2.00%  
Line of credit facility, interest rate at period end   3.60%  
Line of credit, expiration date   Aug. 12, 2021  
Long-Term Compensation Plan [Member]      
Commitments and Contingencies [Line Items]      
Award payouts, stock   0 0
Long-Term Compensation Plan [Member] | 2015 to 2017 [Member] | Performance Units [Member]      
Commitments and Contingencies [Line Items]      
Percentage paid out in stock   100.00%  
Long-Term Compensation Plan [Member] | 2016 to 2018 and 2017 to 2019 [Member] | Performance Units [Member]      
Commitments and Contingencies [Line Items]      
Percentage paid out in stock   50.00%  
Percentage paid out in cash   50.00%  
Maximum [Member]      
Commitments and Contingencies [Line Items]      
Operating lease terms   5 years  
Minimum [Member]      
Commitments and Contingencies [Line Items]      
Operating lease terms   1 year  
Minimum [Member] | Line of Credit [Member]      
Commitments and Contingencies [Line Items]      
Line of credit, covenant, liquidity requirement   $ 10,000,000