Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

v3.4.0.3
Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
May. 19, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of options outstanding 909,913   721,924    
Aggregate intrinsic value of options outstanding $ 78,000        
Intrinsic value of all options exercised 0        
Net cash proceeds from exercise of stock options 0 $ 0      
Unrecognized compensation expense for awards $ 1,152,000        
Recognition period for unrecognized compensation expense 2 years 3 months 18 days        
Excess tax benefits from exercise of stock options $ (23,000) (6,000)      
Share based compensation expense before income taxes 279,642 238,349      
Share based compensation expense after income taxes $ 182,000 $ 155,000      
2011 Executive Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards authorized         2,000,000
Awards eligible for grant 852,332        
Shares issued under Plan 110,091        
Number of options outstanding 1,037,577        
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  
Award expiration period 10 years        
Number of options outstanding 75,000        
1992 Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available 22,008        
Number of options granted 0        
Deferred stock awards granted 0        
Employee Stock Ownership 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 94,790        
Key Employees [Member] | 2011 Executive Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred stock awards granted 93,828        
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 187,989        
Award expiration period 7 years        
Deferred Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted 102,161