7. Stockholders' Equity (Details)	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Dividend Yield	0.00%
Volatility	0.00%
Risk-Free Interest Rate	0.00%
Expected Life	0 years	3 years 3 months
Minimum [Member]
Dividend Yield	2.74%
Volatility	31.61%
Risk-Free Interest Rate	1.01%
Maximum [Member]
Dividend Yield	3.18%
Volatility	31.81%
Risk-Free Interest Rate	1.11%

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 (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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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Weighted average expected volatility of stock price.

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