Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information (in thousands)

	Years Ended December 31,
	2017		2016		2015
Cash paid during the year for:
Interest	$	140	$	113	$	948
Income taxes	$	6,718	$	4,908	$	4,152

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,
	2017		2016		2017		2016		Valuation Technique
Foreign exchange hedges	$	111	$	(352)	$	111	$	(352)	Cash flows approach

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

	2017		2016
Beginning balance	$	334	$	400
Additions		69		293
Write-offs		(57)		(359)
Ending balance	$	346	$	334

Schedule of inventories, net

	December 31,		December 31,
	2017		2016
Lime and limestone inventories:
Raw materials	$	5,105	$	4,811
Finished goods		2,266		2,070
	$	7,371	$	6,881
Service parts inventories		6,175		5,552
	$	13,546	$	12,433

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

Buildings and building and leasehold improvements	3	-	20	years
Machinery and equipment	2	-	20	years
Furniture and fixtures	3	-	10	years
Automotive equipment	3	-	10	years

Schedule of other assets (in thousands)

	December 31,
	2017		2016
Deferred financing costs	$	35	$	49
Other		678		93
	$	713	$	142

Schedule of computation of basic and diluted income per common share

	Years Ended December 31,
	2017		2016		2015
Net income for basic and diluted income per common share	$	27,148	$	17,754	$	12,886
Weighted-average shares for basic income per common share		5,577,312		5,567,902		5,598,805
Effect of dilutive securities:
Employee and director stock options(1)		11,184		4,071		5,423
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,588,496		5,571,973		5,604,228
Basic net income per common share	$	4.87	$	3.19	$	2.30
Diluted net income per common share	$	4.86	$	3.19	$	2.30

(1) Excludes 0,  22,425, and 24,225 stock options in 2017, 2016 and 2015, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.