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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information

The following is a tabulation of the unaudited quarterly results of operations for the two years ended December 31, 2020:

Three Months Ended

3/28/20

6/27/20

9/26/20

12/31/20

Net Sales

$

123,639

$

130,264

$

145,705

$

169,260

Gross profit

36,009

40,085

51,152

64,195

Net income

15,338

18,594

24,753

31,713

Basic earnings per share

0.88

1.06

1.42

1.81

Diluted earnings per share

$

0.87

$

1.05

$

1.39

$

1.78

Three Months Ended

3/30/19

6/29/19

9/28/19

12/31/19

Net Sales

$

114,039

$

96,329

$

94,999

$

105,139

Gross profit

32,597

22,302

19,867

24,782

Net income

13,033

6,233

4,817

8,208

Basic earnings per share

0.75

0.36

0.28

0.47

Diluted earnings per share

$

0.74

$

0.35

$

0.27

$

0.46