Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information (in thousands)

	Years Ended December 31,
	2023		2022		2021
Cash paid during the year for:
Interest	$	196	$	113	$	151
Income taxes	$	17,994	$	7,827	$	9,483

Schedule of additions and write-offs to the Company's allowance for doubtful accounts (in thousands)

	2023		2022
Beginning balance	$	550	$	450
Additions		49		108
Adjustments for expected credit loss factors		—		—
Write-offs		(24)		(8)
Ending balance	$	575	$	550

Schedule of inventories, net

	December 31,
	2023		2022
Lime and limestone inventories:
Raw materials	$	7,834	$	5,506
Finished goods		3,107		2,951
		10,941		8,457
Parts inventories		13,372		11,122
	$	24,313	$	19,579

Schedule of estimated useful lives of property, plant and equipment (in thousands)

Buildings and building and leasehold improvements	3	-	25	years
Machinery and equipment	2	-	30	years
Furniture and fixtures	3	-	10	years
Automotive equipment	3	-	10	years

Schedule of accrued expenses (in thousands)

	December 31,
	2023		2022
Personnel related expenses	$	4,073	$	2,970
Income taxes		2,010		237
Other taxes		1,112		1,208
Utilities		944		1,207
Other		366		779
	$	8,505	$	6,401

Schedule of computation of basic and diluted income per common share

	Years Ended December 31,
	2023		2022		2021
Net income for basic and diluted income per common share	$	74,549	$	45,429	$	37,045
Weighted-average shares for basic income per common share		5,692,391		5,671,960		5,656,367
Effect of dilutive securities:
Employee and director stock options(1)		14,285		8,449		11,992
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,706,676		5,680,409		5,668,359
Basic net income per common share	$	13.10	$	8.01	$	6.55
Diluted net income per common share	$	13.06	$	8.00	$	6.54

(1) Excludes 1,875, 16,125, and 600 stock options in 2023, 2022, and 2021, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.