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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Vote
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Earnings Per Share [Abstract]        
Percentage of earnings assumed to be distributed as dividends in earnings per share calculation     100.00%  
Preferential dividend rate     105.00%  
Class A Common Stock [Member]        
Earnings Per Share [Abstract]        
Number of votes per share | Vote     10  
Numerator [Abstract]        
Distributed earnings $ 215 $ 261 $ 506 $ 560
Undistributed earnings 845 187 690 189
Basic $ 1,060 $ 448 $ 1,196 $ 749
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,532 1,621 1,532 1,689
Earnings Per Share [Abstract]        
Basic earnings per share (in dollars per share) | $ / shares $ 0.69 $ 0.28 $ 0.78 $ 0.44
Diluted earnings per share (in dollars per share) | $ / shares $ 0.69 $ 0.27 $ 0.78 $ 0.44
Common Stock [Member]        
Earnings Per Share [Abstract]        
Number of votes per share | Vote     1  
Numerator [Abstract]        
Distributed earnings $ 2,593 $ 3,338 $ 6,052 $ 6,725
Undistributed earnings 9,987 2,260 8,211 2,194
Basic 12,580 5,598 14,263 8,919
Diluted $ 13,640 $ 6,046 $ 15,459 $ 9,668
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 17,245 18,642 17,353 18,716
Assumed conversion of Class A Common Stock (in shares) | shares 1,532 1,621 1,532 1,689
Dilutive options, awards and common stock equivalents (in shares) | shares 208 279 241 318
Total weighted-average diluted Common Stock (in shares) | shares 18,985 20,542 19,126 20,723
Earnings Per Share [Abstract]        
Basic earnings per share (in dollars per share) | $ / shares $ 0.73 $ 0.30 $ 0.82 $ 0.48
Diluted earnings per share (in dollars per share) | $ / shares $ 0.72 $ 0.29 $ 0.81 $ 0.47