Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions - Narrative (Details)

v3.21.2
Capital Transactions - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
May 05, 2021
Apr. 05, 2021
Mar. 10, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2015
Dec. 31, 2020
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock, dividends (in dollars per share)   $ 1.00                  
Dividends, common stock, cash   $ 19,900,000     $ 19,858,000            
Stock repurchase program, authorized amount     $ 15,000,000.0                
Stock repurchase program, remaining authorized repurchase amount       $ 13,500,000     $ 13,500,000        
2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares authorized under the plan (in shares)                     1,500,000
Additional number of shares authorized under the plan (in shares) 2,000,000               1,500,000    
Stock options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense     $ 0 0   $ 0 0 $ 0      
Unrecognized share-based compensation expense       $ 0     $ 0     $ 0  
Stock dividends (in shares)     4,300                
Options outstanding (in shares)       176,000     176,000     226,000  
Aggregate intrinsic value, outstanding       $ 900,000     $ 900,000     $ 700,000  
Exercised (in shares)             50,000 25,000      
Exercised (in dollars per share)             $ 12.00 $ 5.79      
Aggregate intrinsic values of options exercised             $ 400,000 $ 100,000      
Tax benefit from the exercise of stock options             $ 200,000 48,000      
Weighted-average grant date fair value (in dollars per share)             $ 0        
Time-based stock options | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period             48 months        
Performance based stock options operating income margins                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
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%        
Unvested stock options outstanding (in shares)       0     0     0  
Performance based stock options operating income margins | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award performance period             1 year        
Performance based stock options operating income margins | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award performance period             1 year 3 months        
RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense     $ 0 $ 600,000   500,000 $ 1,000,000.0 $ 800,000      
Unrecognized share-based compensation expense       $ 2,600,000     $ 2,600,000     $ 1,300,000  
Discount for lack of marketability             12.70%        
Award performance period             3 years        
Weighted-average period over which the remaining compensation cost is expected to be recognized             10 months 24 days        
Minimum withholding requirements (in shares)             121,000 24,000      
RSUs | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)             300,000        
RSUs | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Expected volatility (as a percent)             50.00%        
Risk-free interest rate (as a percent)             0.30%        
RSUs | Minimum | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period             12 months        
RSUs | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Expected volatility (as a percent)             54.70%        
Risk-free interest rate (as a percent)             2.90%        
RSUs | Maximum | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period             36 months        
RSUs | Director | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restriction period for issuance of shares             2 years        
Nonvested subject to restriction period (in shares)       87,000     87,000     82,000  
Time-Based Restricted Stock Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)     22,000                
Time-Based Restricted Stock Units (RSUs) | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period             3 years        
Weighted-average grant date fair value (in dollars per share)             $ 18.25        
Performance-Based Restricted Stock Units (RSUs)                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation expense       $ 500,000   $ 200,000 $ 900,000 $ 300,000      
Granted (in shares)     26,200                
Share based compensation potential compensation expense to be recognized       2,100,000     $ 2,100,000        
Performance-Based Restricted Stock Units (RSUs) | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Weighted-average grant date fair value (in dollars per share)             $ 13.87        
Performance-Based Restricted Stock Units (RSUs) | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation potential compensation expense to be recognized       $ 2,200,000     $ 2,200,000        
Performance-Based Restricted Stock Units (RSUs) | Net Sales and Operating Income Targets | 2012 Stock Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period             3 years