Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information (in thousands)

	Years Ended December 31,
	2019		2018		2017
Cash paid during the year for:
Interest	$	150	$	179	$	140
Income taxes	$	445	$	331	$	6,718

Schedule of the entity's financial liabilities measured at fair value on a recurring basis (in thousands)

					Significant Other
					Observable Inputs
					(Level 2)
	December 31,		December 31,		December 31,		December 31,
	2019		2018		2019		2018		Valuation Technique
Foreign exchange hedges	$	(1)	$	(16)	$	(1)	$	(16)	Cash flows approach

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

	2019		2018
Beginning balance	$	430	$	346
Additions		102		109
Write-offs		(171)		(25)
Ending balance	$	361	$	430

Schedule of inventories, net

	December 31,		December 31,
	2019		2018
Lime and limestone inventories:
Raw materials	$	4,546	$	4,693
Finished goods		1,954		2,153
		6,500		6,846
Service parts inventories		6,888		6,000
	$	13,388	$	12,846

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 other assets (in thousands)

	December 31,
	2019		2018
Deferred financing costs	$	28	$	19
Other		395		530
	$	423	$	549

Schedule of computation of basic and diluted income per common share

	Years Ended December 31,
	2019		2018		2017
Net income for basic and diluted income per common share	$	26,056	$	19,685	$	27,148
Weighted-average shares for basic income per common share		5,612,048		5,595,384		5,577,312
Effect of dilutive securities:
Employee and director stock options(1)		9,090		6,993		11,184
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,621,138		5,602,377		5,588,496
Basic net income per common share	$	4.64	$	3.52	$	4.87
Diluted net income per common share	$	4.64	$	3.51	$	4.86

(1) Excludes 8,700,  9,900 and 0 stock options in 2019, 2018 and 2017, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.