Summary of Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Data [Abstract]

Summary of Quarterly Results of Operations

	2018
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Full Year
Net sales	$	3,965,006	$	4,773,796	$	4,731,470	$	4,064,221	$	17,534,493
Gross profit	1,686,847		2,038,628		2,010,404		1,682,683		7,418,562
Net income	250,127		403,604		354,027		100,988		1,108,746
Net income per share - basic	2.68		4.34		3.80		1.09		11.92
Net income per share - diluted	2.62		4.25		3.72		1.07		11.67

	2017
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Full Year
Net sales	$	2,761,387	$	3,735,817	$	4,507,020	$	3,979,564	$	14,983,788
Gross profit	1,343,053		1,734,617		1,901,827		1,739,303		6,718,800
Net income	239,152		319,111		316,606		853,079		1,727,948
Net income per share - basic	2.58		3.44		3.40		9.14		18.60
Net income per share - diluted	2.53		3.36		3.33		8.92		18.20