Concentration of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2016

Concentration of Credit Risk [Abstract]

Changes in the allowance for doubtful accounts

An analysis of the changes in the allowance for doubtful accounts is presented as follows (in thousands):

	2016			2015			2014
Balance, beginning of year	$	206		$	179		$	252
Provisions for bad debts		100			116			50
Less:  Write-offs and recoveries		(81	)		(89	)		(123	)
Balance, end of year	$	225		$	206		$	179

Schedule of customers providing more than 10 percent of revenues

Management believes that a loss of any of those customers where the Company currently derives more than 10 percent of its revenues would not have a material adverse effect on the Company’s operations as shown below:

Individual customer sales			Individual customer receivables in excess
in excess of 10% of revenues			of 10% of total receivables as of December 31,
2016	2015	2014	2016	2015	2014
18.2%	24.4%	20.3%	20.9%	20.3%	16.6%
16.5%	13.8%	14.0%	14.0%	16.5%	16.6%
15.9%	-	-	10.1%	12.7%	10.4%
10.6%	-	-	-	-	-