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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Trade accounts receivable, allowance for doubtful accounts $ 324 $ 296
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) 20,268,050 20,053,335
Common stock, shares outstanding (in shares) 15,866,868 15,920,585
Treasury stock, shares (in shares) 4,401,182 4,132,750