Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 333,313	$ 285,907	$ 279,317
Cost of sales	289,059	235,388	232,133
Gross profit	44,254	50,519	47,184
Selling, general, and administrative expense	28,222	24,954	18,495
Operating income	16,032	25,565	28,689
Other income	328	953	4,383
Interest income	0	49	40
Interest expense	(1,202)	(933)	(472)
Income before income taxes	15,158	25,634	32,640
Income tax expense	3,635	6,584	4,738
Net income	$ 11,523	$ 19,050	$ 27,902
us-gaap_EarningsPerShareAbstract
Basic (in dollars per share)	$ 1.17	$ 1.95	$ 2.86
Diluted (in dollars per share)	$ 1.16	$ 1.93	$ 2.85
Shares used in per share calculations:
Basic (in shares)	9,854	9,788	9,741
Diluted (in shares)	9,928	9,873	9,779

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