Significant Subsidiaries (Details) (Pilot House Associates Limited Partnership [Member], USD $)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Pilot House Associates Limited Partnership [Member]
Revenue	$ 314,000	$ 313,400
Net Income	$ 26,300	$ 26,400

The amount of net income (loss) reported by an equity method investment of the entity.

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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details