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Share-Based Payment Arrangements (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2017
Mar. 31, 2017
Jul. 22, 2016
Apr. 01, 2016
Mar. 31, 2016
May 29, 2015
Sep. 08, 2014
Apr. 10, 2013
Jul. 27, 2012
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Shares issued of vested units 5,998     7,144                          
Stock options, granted                       0 0        
Long Term Incentive Plan 2005 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of incentive stock options to purchase shares of common stock outstanding                       168,187          
Number of non-qualified stock options to purchase shares of common stock outstanding                       259,157          
Number of restricted stock units to receive shares of common stock                       77,640          
Long Term Incentive Plan 2015 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Stock compensation plan, number of shares authorized                   2,000,000   2,000,000          
Number of restricted stock units to receive shares of common stock                       292,961          
Stock options, granted                       0          
Long Term Incentive Plan 2005 and 2015 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Total unrecognized compensation cost related to non-vested share-based compensation arrangements                   $ 0   $ 0          
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Share-based Compensation Award, Tranche One [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Percentage of options vested or expected to vest                   10.00%   10.00%          
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Share-based Compensation Award, Tranche Two [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Percentage of options vested or expected to vest                   20.00%   20.00%          
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Share-based Compensation Award, Tranche Three [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Percentage of options vested or expected to vest                   30.00%   30.00%          
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Share-based Compensation Award, Tranche Four [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Percentage of options vested or expected to vest                   40.00%   40.00%          
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Minimum [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Incentive stock options termination period                       5 years          
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Maximum [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Incentive stock options termination period                       10 years          
Incentive Stock Options 2009 [Member] | Long Term Incentive Plan 2005 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Incentive stock options termination period                       10 years          
Share-based payment award vesting rights                       vest in equal annual increments on each of the first seven anniversary dates          
Incentive Stock Options 2010 [Member] | Long Term Incentive Plan 2005 [Member] | 25,000 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Incentive stock options termination period                       10 years          
Number of options vested or expected to vest                   25,000   25,000          
Share-based payment award vesting rights                       vests in equal annual increments on each of the first three anniversary dates          
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage                       100.00%          
Incentive stock options termination period                       10 years          
Share-based payment, award vesting period                       6 months          
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | 200,000 Grant [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Incentive stock options termination period                       10 years          
Number of options vested or expected to vest                   200,000   200,000          
Share-based payment award vesting rights                       vests in equal annual increments on each of the first seven anniversary dates          
Restricted Stock Units (RSUs) [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Other than options, granted             5,998 7,144              
Other than options, forfeited                       43,509 71,460        
Vested   5,998     7,144             5,998 7,144        
Allocated share-based compensation expense                   $ 19,000 $ 89,000 $ 46,000 $ 190,000        
Income tax benefit of share-based payments recognized in income                   $ 7,000 $ 32,000 $ 16,000 $ 67,000        
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Percentage of restricted stock units granted as result of meeting growth rates                   50.00%   50.00%          
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Percentage of restricted stock units granted as result of meeting growth rates                   150.00%   150.00%          
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Other than options, granted             175,983 122,823 129,463                
Other than options, forfeited                           9,280      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2015 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Total unrecognized compensation cost related to non-vested share-based compensation arrangements                   $ 98,000   $ 98,000          
Compensation costs expected to be recognized during remainder of the fiscal period                   37,000   37,000          
Compensation costs expected to be recognized during next fiscal year                   50,000   50,000          
Compensation costs expected to be recognized in second future fiscal year                   $ 11,000   $ 11,000          
Other than options, granted     122,770     103,351                      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 and 2015 [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Other than options, grant date fair value                             $ 11.41 $ 11.10 $ 9.66