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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement    
Net sales $ 77,536 $ 71,040
Cost of goods sold 59,885 56,134
Gross profit 17,651 14,906
Selling, general and administrative expenses 8,618 8,008
Operating income 9,033 6,898
Interest income 33 51
Income before income taxes 9,066 6,949
Income tax provision 1,457 1,688
Net income $ 7,609 $ 5,261
Earnings per share    
Basic (in dollars per shares) $ 0.22 $ 0.15
Diluted (in dollars per shares) 0.22 0.15
Dividends paid per share (in dollars per share) $ 0.10 $ 0.07