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Consolidated Balance Sheets (Parenthetical)
$ in Thousands
Dec. 31, 2023
USD ($)
Vote
$ / shares
shares
Dec. 31, 2022
USD ($)
Vote
$ / shares
shares
Accounts receivable, allowance | $ $ 130 $ 87
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 11,743,218 11,743,218
Common Stock, shares outstanding 11,743,218 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 44,354,394 43,976,336
Common Stock, shares outstanding 32,719,588 32,341,530