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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
Jun. 28, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Trade accounts receivable allowance for doubtful accounts $ 333,000 $ 340,000
Preferred stock - par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 18,974,211 18,941,544
Treasury stock shares 3,090,225 1,600,731