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Commitments and Contingencies (Details) (USD $)	6 Months Ended
Commitments and Contingencies (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance - January 1	$ 1,210,919	$ 862,480
Additions for current year deliveries	346,970	445,570
Reductions for payments made	(537,879)	(336,950)
Ending balance - June 30	$ 1,020,010	$ 971,100

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References+ Details