Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Changes in the allowance for doubtful accounts

The following table presents our allowance for doubtful accounts activity for the periods indicated (in thousands):


	December 31,
	2018		2017		2016

Balance at beginning of period	$	303	$	225	$	206
Charges to costs and expenses	43		137		100
Deductions	(193)		(59)		(81)
Balance at end of period	$	153	$	303	$	225

Schedule of earnings per share, basic and diluted

A reconciliation of the calculation of basic and diluted earnings (losses) per share is as follows (in thousands, except per share data):


	Year Ended December 31,
	2018		2017		2016
Earnings (losses) per share – numerator:
Earnings (losses) from continuing operations	$	2,945	$	(482)	$	3,943
Losses from investment in unconsolidated affiliate, net of tax	—		—		(1,430)
Net (losses) earnings	$	2,945	$	(482)	$	2,513

Denominator:
Basic weighted average number of shares outstanding	4,218		4,218		4,218

Basic earnings (losses) per share:
From continuing operations	$	0.70	$	(0.11)	$	0.94
From investment in unconsolidated affiliate	—		—		(0.34)
Basic earnings (losses) per share	$	0.70	$	(0.11)	$	0.60

Diluted earnings (losses) per share:

Diluted weighted average number of shares outstanding:
Common shares	4,218		4,218		4,218
Restricted stock unit awards ⁽¹⁾	—		—		—
Performance share unit awards ⁽²⁾	—		—		—
Total	4,218		4,218		4,218

Diluted earnings (losses) per share:
From continuing operations	$	0.70	$	(0.11)	$	0.94
From investment in unconsolidated affiliate	—		—		(0.34)
Diluted earnings (losses) per share	$	0.70	$	(0.11)	$	0.60

________________________

(1) The dilutive effect of restricted stock unit awards for the year ended December 31, 2018 is de minimis.

(2) The dilutive effect of performance share awards will be included in the calculation of diluted earnings per share when the performance share award performance conditions have been achieved.

Schedule of cost of retirement plans

Our 401(k) plan contributory expenses were as follows for the periods indicated (in thousands):


	Year Ended December 31,
	2018		2017		2016

Contributory expenses	$	808	$	734	$	757