Consolidated Balance Sheets (Parenthetical) $ in Thousands	Dec. 31, 2024 USD ($) Vote $ / shares shares	Dec. 31, 2023 USD ($) Vote $ / shares shares
Accounts receivable, allowance | $	$ 130	$ 130
Treasury stock, shares	11,649,110	11,634,806
Class B Common Stock [Member]
Common Stock, votes per share | Vote	10	10
Common Stock, par value | $ / shares	$ 0.01	$ 0.01
Common Stock, shares authorized	14,000,000	14,000,000
Common Stock, shares issued	11,738,718	11,743,218
Common Stock, shares outstanding	11,738,718	11,743,218
Common Stock [Member]
Common Stock, votes per share | Vote	1	1
Common Stock, par value | $ / shares	$ 0.01	$ 0.01
Common Stock, shares authorized	62,000,000	62,000,000
Common Stock, shares issued	45,082,156	44,354,394
Common Stock, shares outstanding	33,433,046	32,719,588