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Basis of Presentation (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Foreign Currency Transaction Gain, before Tax	$ 15,000
Foreign Currency Transaction Loss, before Tax		$ 141,000
GKFDB#1, LLC [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	50.00%
GKFDB#2, LLC [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	50.00%

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Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



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-Name Accounting Standards Codification

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