Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 69,971	$ 69,203	$ 138,894	$ 131,846
Cost of sales	57,013	60,985	116,357	117,057
Gross profit	12,958	8,218	22,537	14,789
Selling, general, and administrative expense	5,584	4,705	13,529	8,952
Operating income	7,374	3,513	9,008	5,837
Other income	1,059	25	658	184
Interest income	11	3	33	7
Interest expense	(262)	(120)	(481)	(251)
Income before income taxes	8,182	3,421	9,218	5,777
Income tax expense	2,184	447	2,656	638
Net income	$ 5,998	$ 2,974	$ 6,562	$ 5,139
us-gaap_EarningsPerShareAbstract
Basic (in dollars per share)	$ 0.61	$ 0.31	$ 0.67	$ 0.53
Diluted (in dollars per share)	$ 0.61	$ 0.31	$ 0.67	$ 0.53
Shares used in per share calculations:
Basic (in shares)	9,792	9,736	9,771	9,736
Diluted (in shares)	9,808	9,753	9,832	9,745

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227