Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) Vote $ / shares shares	Mar. 31, 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	$ 291	$ 299
Undistributed earnings	(149)	(5)
Basic	$ 142	$ 294
Denominator [Abstract]
Weighted average shares outstanding (in shares) | shares	1,532	1,757
Earnings Per Share [Abstract]
Basic earnings per share (in dollars per share) | $ / shares	$ 0.09	$ 0.17
Diluted earnings per share (in dollars per share) | $ / shares	$ 0.09	$ 0.17
Common Stock [Member]
Earnings Per Share [Abstract]
Number of votes per share | Vote	1
Numerator [Abstract]
Distributed earnings	$ 3,459	$ 3,386
Undistributed earnings	(1,782)	(59)
Basic	1,677	3,327
Diluted	$ 1,819	$ 3,621
Denominator [Abstract]
Weighted average shares outstanding - basic (in shares) | shares	17,460	18,792
Assumed conversion of Class A Common Stock (in shares) | shares	1,532	1,757
Dilutive options, awards and common stock equivalents (in shares) | shares	274	357
Total weighted-average diluted Common Stock (in shares) | shares	19,266	20,906
Earnings Per Share [Abstract]
Basic earnings per share (in dollars per share) | $ / shares	$ 0.10	$ 0.18
Diluted earnings per share (in dollars per share) | $ / shares	$ 0.09	$ 0.17