Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 72,311	$ 68,923
Cost of sales	63,536	59,344
Gross profit	8,775	9,579
Selling, general, and administrative expense	5,830	7,945
Operating income	2,945	1,634
Other income (expense)	59	(401)
Interest income	0	22
Interest expense	(227)	(219)
Income before income taxes	2,777	1,036
Income tax expense	602	472
Net income	$ 2,175	$ 564
us-gaap_EarningsPerShareAbstract
Basic (in dollars per share)	$ 0.22	$ 0.06
Diluted (in dollars per share)	$ 0.22	$ 0.06
Shares used in per share calculations:
Basic (in shares)	9,814	9,751
Diluted (in shares)	9,921	9,829

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