Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 84,643	$ 77,632	$ 230,766	$ 216,526
Cost of sales	72,280	62,013	200,090	178,370
Gross profit	12,363	15,619	30,676	38,156
Selling, general, and administrative expense	5,562	5,656	17,729	19,185
Operating income	6,801	9,963	12,947	18,971
Other income	171	157	260	815
Interest income	0	16	0	49
Interest expense	(112)	(238)	(687)	(719)
Income before income taxes	6,860	9,898	12,520	19,116
Income tax expense	1,914	2,631	3,268	5,287
Net income	$ 4,946	$ 7,267	$ 9,252	$ 13,829
Basic (in dollars per share)	$ 0.50	$ 0.74	$ 0.94	$ 1.41
Diluted (in dollars per share)	$ 0.50	$ 0.73	$ 0.93	$ 1.40
Shares used in per share calculations:
Basic (in shares)	9,871	9,802	9,849	9,782
Diluted (in shares)	9,921	9,861	9,918	9,851

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