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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade accounts receivable, allowance for doubtful accounts $ 317 $ 324
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
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) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 40,000,000 40,000,000
Common stock, shares issued (in shares) 20,373,519 20,268,050
Common stock, shares outstanding (in shares) 15,959,984 15,866,868
Treasury stock, shares (in shares) 4,413,535 4,401,182