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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS      
Net sales $ 292,136 $ 298,616 $ 267,316
Cost of goods sold 226,742 232,293 208,296
Gross profit 65,394 66,323 59,020
Selling, general and administrative expenses 31,259 30,936 29,261
Operating income 34,135 35,387 29,759
Interest income 323 268 229
Income before income taxes 34,458 35,655 29,988
Income tax provision 6,219 7,167 10,688
Net income $ 28,239 $ 28,488 $ 19,300
EARNINGS PER SHARE      
Basic (in dollars per share) $ 0.83 $ 0.83 $ 0.55
Diluted (in dollars per share) 0.83 0.83 0.55
Dividends paid per share (in dollars per share) $ 0.58 $ 0.50 $ 0.33