Stockholders' Equity (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Aug. 24, 2012
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum hours per week required to participate in ESPP	15 hours
Period of intervals after which common stock may be purchased by employees	3 months
Percentage of fair market value of common stock purchased at by employees	85.00%
Number of shares purchased by employees under Employee Stock Purchase Plan	11,286	10,869
Shares issued for Employee Stock Purchase Plan	290,486
Shares available under plan	350,000
KSOP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of service required to be eligible for KSOP	6 months
Employer contributions to 401(k) plan	$ 371,000	$ 195,000
Stock Repurchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for repurchase	128,781		100,000
Shares repurchased	0	0