Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information (in thousands)

	Years Ended December 31,
	2018		2017		2016
Cash paid during the year for:
Interest	$	179	$	140	$	113
Income taxes	$	331	$	6,718	$	4,908

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,
	2018		2017		2018		2017		Valuation Technique
Foreign exchange hedges	$	(16)	$	111	$	(16)	$	111	Cash flows approach

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

	2018		2017
Beginning balance	$	346	$	334
Additions		109		69
Write-offs		(25)		(57)
Ending balance	$	430	$	346

Schedule of inventories, net

	December 31,		December 31,
	2018		2017
Lime and limestone inventories:
Raw materials	$	4,693	$	5,105
Finished goods		2,153		2,266
		6,846		7,371
Service parts inventories		6,000		6,175
	$	12,846	$	13,546

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	-	25	years
Furniture and fixtures	3	-	10	years
Automotive equipment	3	-	10	years

Schedule of other assets (in thousands)

	December 31,
	2018		2017
Deferred financing costs	$	19	$	35
Other		530		678
	$	549	$	713

Schedule of computation of basic and diluted income per common share

	Years Ended December 31,
	2018		2017		2016
Net income for basic and diluted income per common share	$	19,685	$	27,148	$	17,754
Weighted-average shares for basic income per common share		5,595,384		5,577,312		5,567,902
Effect of dilutive securities:
Employee and director stock options(1)		6,993		11,184		4,071
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,602,377		5,588,496		5,571,973
Basic net income per common share	$	3.52	$	4.87	$	3.19
Diluted net income per common share	$	3.51	$	4.86	$	3.19

(1) Excludes 9,900,  0, and 22,425 stock options in 2018, 2017 and 2016, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.

The Company paid $0.54,  $0.54 and $0.50 of cash dividends per share of common stock in 2018, 2017 and 2016, respectively.