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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Trade accounts receivable, allowance for doubtful accounts $ 300   $ 303
Preferred stock, par value (in dollars per share)   $ 0.1 $ 0.1
Preferred Stock, Shares Authorized (in shares)   1,000,000 1,000,000
Preferred Stock, Shares Issued (in shares)   0 0
Common stock, par value (in dollars per share)   $ 0.1 $ 0.1
Common Stock, Shares Authorized (in shares)   40,000,000 40,000,000
Common stock, shares issued (in shares)   20,783,607 20,570,710
Common stock, shares outstanding (in shares)   16,347,493 16,135,358
Treasury Stock, Common, Shares (in shares)   4,436,114 4,435,352