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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Trade accounts receivable, allowance for doubtful accounts $ 292 $ 277
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) 19,670,928 19,324,723
Common stock, shares outstanding (in shares) 15,651,217 15,308,971
Treasury stock, shares (in shares) 4,019,711 4,015,752