Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

v3.8.0.1
Stock-Based Compensation (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 4 Months Ended 72 Months Ended
Aug. 31, 2011
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2011
Dec. 31, 2017
May 19, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options outstanding   1,332,272     1,172,659  
Aggregate intrinsic value of options outstanding   $ 0        
Intrinsic value of all options exercised   0        
Net cash proceeds from exercise of stock options   0 $ 0      
Share based compensation expense before income taxes   85,000 93,000      
Share based compensation expense after income taxes   67,000 $ 60,000      
Unrecognized compensation expense for awards   $ 583,000        
Recognition period for unrecognized compensation expense   2 years 8 months 12 days        
2011 Executive Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of awards authorized           2,000,000
Shares issued under Plan   194,762        
Number of options outstanding   1,609,007        
Awards eligible for grant   196,231        
2011 Executive Incentive Compensation Plan [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage   25.00%        
Stock Option Plan For Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options granted 0 0   0 0  
Award expiration period   10 years        
Number of options outstanding   51,000        
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of price of common stock at which employees are able to acquire   85.00%        
Shares available   45,250        
Key Employees [Member] | 2011 Executive Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Deferred stock awards granted   163,002        
Key Executive Employees [Member] | 2011 Executive Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options granted   178,665        
Award expiration period   7 years