12. Stockholders' Equity (Details)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Dividend Yield	2.62%	2.97%
Volatility	34.54%	40.53%
Risk-Free Interest Rate	1.03%	0.92%
Expected Life	3 years	3 years 3 months

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Weighted average expected volatility of stock price.

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