Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information (in thousands)

	Years Ended December 31,
	2015		2014		2013
Cash paid during the year for:
Interest	$	948	$	1,495	$	1,746
Income taxes	$	4,152	$	5,870	$	3,750

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

	Fair Value Measurements as of December 31,
					Significant Other
					Observable Inputs
					(Level 2)
	December 31,		December 31,		December 31,		December 31,
	2015		2014		2015		2014		Valuation Technique
Interest rate swap liabilities	$	—	$	(661)	$	—	$	(661)	Cash flows approach

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

	2015		2014
Beginning balance	$	350	$	238
Additions		63		148
Write-offs		(13)		(36)
Ending balance	$	400	$	350

Schedule of inventories, net (in thousands)

	December 31,		December 31,
	2015		2014
Lime and limestone inventories:
Raw materials	$	6,627	$	5,693
Finished goods		2,049		2,283
	$	8,676	$	7,976
Service parts inventories		6,052		5,460
	$	14,728	$	13,436

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,
	2015		2014
Deferred financing costs	$	63	$	45
Other		97		100
	$	160	$	145

Schedule of computation of basic and diluted income per common share (in thousands)

	Years Ended December 31,
	2015		2014		2013
Net income for basic and diluted income per common share	$	12,886	$	19,367	$	14,800
Weighted-average shares for basic income per common share		5,598,805		5,578,784		5,561,429
Effect of dilutive securities:
Employee and director stock options(1)		5,423		10,459		9,850
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,604,228		5,589,243		5,571,279
Basic net income per common share	$	2.30	$	3.47	$	2.66
Diluted net income per common share	$	2.30	$	3.47	$	2.66

(1) Excludes 24,225,  7,500 and 15,000 stock options in 2015, 2014 and 2013, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.