Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information (in thousands)

	Years Ended December 31,
	2022		2021		2020
Cash paid during the year for:
Interest	$	113	$	151	$	152
Income taxes	$	7,827	$	9,483	$	975

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

	2022		2021
Beginning balance	$	450	$	398
Additions		108		66
Adjustments for expected credit loss factors		—		(14)
Write-offs		(8)		—
Ending balance	$	550	$	450

Schedule of inventories, net

	December 31,
	2022		2021
Lime and limestone inventories:
Raw materials	$	5,506	$	3,232
Finished goods		2,951		2,677
		8,457		5,909
Service parts inventories		11,122		9,207
	$	19,579	$	15,116

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,
	2022		2021
Personnel related expenses	$	2,970	$	2,344
Income taxes		237		—
Other taxes		1,208		1,374
Utilities		1,207		615
Other		779		523
	$	6,401	$	4,856

Schedule of computation of basic and diluted income per common share

	Years Ended December 31,
	2022		2021		2020
Net income for basic and diluted income per common share	$	45,429	$	37,045	$	28,223
Weighted-average shares for basic income per common share		5,671,960		5,656,367		5,629,425
Effect of dilutive securities:
Employee and director stock options(1)		8,449		11,992		10,438
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,680,409		5,668,359		5,639,863
Basic net income per common share	$	8.01	$	6.55	$	5.01
Diluted net income per common share	$	8.00	$	6.54	$	5.00

(1) Excludes 16,125, 600 and 5,550 stock options in 2022, 2021 and 2020, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.