Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 73,812	$ 69,971	$ 146,123	$ 138,894
Cost of sales	64,274	57,013	127,810	116,357
Gross profit	9,538	12,958	18,313	22,537
Selling, general, and administrative expense	6,337	5,584	12,167	13,529
Operating income	3,201	7,374	6,146	9,008
Other income	30	1,059	89	658
Interest income	0	11	0	33
Interest expense	(348)	(262)	(575)	(481)
Income before income taxes	2,883	8,182	5,660	9,218
Income tax expense	752	2,184	1,354	2,656
Net income	$ 2,131	$ 5,998	$ 4,306	$ 6,562
us-gaap_EarningsPerShareAbstract
Basic (in dollars per share)	$ 0.22	$ 0.61	$ 0.44	$ 0.67
Diluted (in dollars per share)	$ 0.21	$ 0.61	$ 0.43	$ 0.67
Shares used in per share calculations:
Basic (in shares)	9,861	9,792	9,837	9,771
Diluted (in shares)	9,915	9,808	9,920	9,832

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=123367319&loc=SL114868664-224227