CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance for accounts receivable	$ 469	$ 648
Accumulated amortization on other intangibles, deferred costs and investments	$ 15,906	$ 15,524
Preferred Stock, Shares Authorized	1,500,000	1,500,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Treasury stock, shares (in shares)	1,758,000	1,751,000
Class A Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	35,000,000	35,000,000
Common Stock, Shares, Issued	6,835,000	6,785,000
Class B Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	3,500,000	3,500,000
Common Stock, Shares, Issued	965,000	938,000
Common Stock, Shares, Outstanding	965,000	938,000