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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
Selected unaudited quarterly financial data were as follows for the years ended December 31:

2020
Quarter ended March 31,Quarter ended June 30,Quarter ended September 30,Quarter ended December 31,
Net sales$73,564 $43,203 $55,281 $57,113 
Gross profit$24,470 $6,604 $13,593 $12,186 
Net income (loss)$4,155 $(5,648)$1,008 $(927)
Net income (loss) per share
Basic$0.28 $(0.38)$0.07 $(0.06)
Diluted$0.28 $(0.38)$0.07 $(0.06)

2019
Quarter ended March 31,Quarter ended June 30,Quarter ended September 30,Quarter ended December 31,
Net sales$100,135 $110,954 $100,094 $86,367 
Gross profit$36,405 $42,073 $36,224 $30,221 
Net income (loss)$15,170 $17,244 $6,915 $(5,288)
Net income (loss) per share
Basic$1.02 $1.17 $0.47 $(0.36)
Diluted$1.01 $1.15 $0.46 $(0.36)