Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions (Details)

v3.4.0.3
Capital Transactions (Details) - USD ($)
 3 Months Ended
Feb. 25, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash dividend per common share (in dollars per share) $ 0.10 $ 0.10 $ 0.10    
Payments of cash dividends $ 1,900,000 $ 1,872,000 $ 1,865,000    
Tax benefit from the exercise of stock options   $ 0 52,000    
Weighted Average Exercise Price Per Share          
Granted (in dollars per share)   $ 0.00      
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercisable (in shares)   1,143,000   958,000  
Expected to vest (in shares)   384,000   588,000  
Aggregate Intrinsic value, outstanding   $ 700,000   $ 900,000  
Aggregate Intrinsic value, exercisable   700,000   900,000  
Aggregate intrinsic values of options exercised   200,000 1,300,000    
Aggregate Intrinsic value, expected to vest   0   0  
Tax benefit from the exercise of stock options   $ 100,000 $ 600,000    
Number of shares          
Options outstanding at the beginning of the period (in shares)   1,683,000      
Granted (in shares)   0      
Forfeited or canceled (in shares)   (50,000)      
Exercised (in shares)   (25,000) (227,000)    
Options outstanding at the end of the period (in shares)   1,608,000      
Weighted Average Exercise Price Per Share          
Options outstanding at the beginning of the period (in dollars per share)   $ 12.21      
Forfeited or canceled (in dollars per share)   11.72      
Exercised (in dollars per share)   2.35 $ 7.63    
Options outstanding at the end of the period (in dollars per share)   $ 12.38      
Performance based stock options operating income margins          
Share-based compensation, additional disclosures          
Operating income margin, one (as a percent)   6.00%      
Operating income margin, two (as a percent)   8.00%      
Operating income margin, three (as a percent)   10.00%      
Performance based stock options sales and operating income margins          
Share-based compensation, additional disclosures          
Vesting period   2 years      
Performance based stock options sales and operating income margins | Minimum          
Share-based compensation, additional disclosures          
Operating income margin, two (as a percent)   8.00%      
Performance based stock options sales          
Share-based compensation, additional disclosures          
Vesting period based on achieving annual net sales targets   1 year      
Performance based stock options sales | Maximum          
Share-based compensation, related information          
Potential compensation expense   $ 400,000      
Time-based stock options          
Share-based compensation, related information          
Share-based compensation expense   300,000 $ 600,000    
Unrecognized share-based compensation expense   $ 800,000   $ 1,100,000  
Weighted-average period over which the remaining compensation cost is expected to be recognized   1 year 6 months      
Time-based stock options | Maximum          
Share-based compensation, additional disclosures          
Vesting period   48 months      
2012 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under the plan       1,500,000  
Additional number of shares authorized under the plan     1,500,000    
2009 Incentive Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under the plan   400,000      
2014 Share Repurchase Program          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchase program, authorized amount         $ 20,000,000
Remaining balance available for repurchases   $ 13,400,000      
Repurchase of common stock (in shares)   0