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Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Mar. 31, 2021 USD ($) Vote $ / shares shares	Dec. 31, 2020 USD ($) Vote $ / shares shares
Accounts receivable, allowance | $	$ 82	$ 82
Treasury stock, shares	11,634,806	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	11,758,218	11,758,218
Common Stock, shares outstanding	11,758,218	11,758,218
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	43,397,118	43,204,671
Common Stock, shares outstanding	31,762,312	31,569,865

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