Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies

Schedule of supplemental cash flow information

	Years Ended December 31,
	2014		2013		2012
Cash paid during the year for:
Interest	$	1,495	$	1,746	$	2,069
Income taxes	$	5,870	$	3,750	$	3,000

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

	Fair Value Measurements as of December 31,
							Significant Other Observable Inputs (Level 2)
	2014			2013			2014			2013			Valuation Technique
Interest rate swap liabilities	$	(661	)	$	(1,533	)	$	(661	)	$	(1,533	)	Cash flows approach

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

	2014			2013
Beginning balance	$	238		$	525
Additions		148			69
Write-offs		(36	)		(356	)
Ending balance	$	350		$	238

Schedule of inventories

	December 31,
	2014		2013
Lime and limestone inventories:
Raw materials	$	5,693	$	6,203
Finished goods		2,283		2,284
	$	7,976	$	8,487
Service parts inventories		5,460		5,201
	$	13,436	$	13,688

Schedule of estimated useful lives of property, plant and equipment

Buildings and building 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

	December 31,
	2014		2013
Deferred financing costs	$	45	$	90
Other		100		105
	$	145	$	195

Schedule of computation of basic and diluted income per common share

	Years Ended December 31,
	2014		2013		2012
Net income for basic and diluted income per common share	$	19,367	$	14,800	$	16,423
Weighted-average shares for basic income per common share		5,578,784		5,561,429		5,705,475
Effect of dilutive securities:
Employee and director stock options(1)		10,459		9,850		10,286
Adjusted weighted-average shares and assumed exercises for diluted income per common share		5,589,243		5,571,279		5,715,761
Basic net income per common share	$	3.47	$	2.66	$	2.88
Diluted net income per common share	$	3.47	$	2.66	$	2.87

(1)Excludes 7,500, 15,000 and 17,400 stock options in 2014, 2013 and 2012, respectively, as antidilutive because the exercise price exceeded the average per share market price for the periods presented.