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Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Trade accounts receivable - allowance for doubtful accouns $ 300 $ 340
Preferred stock - par value (in dollars per share) $ 0.1 $ 0.1
Preferred stock - shares authorized 10,000,000 10,000,000
Preferred stock - shares issued 0 0
Preferred stock - shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.1 $ 0.1
Common stock - shares authorized 40,000,000 40,000,000
Common stock - shares issued 19,181,815 18,941,544
Common stock - shares outstanding 15,322,155 17,340,813
Treasury stock - shares 3,859,660 1,600,731