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Commitments and Contingencies - Product Warranty Accrual (Details) (USD $)	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Loss Contingencies [Line Items]
Reserve for warranty	$ 2,287,000us-gaap_ProductWarrantyAccrual	$ 1,338,000us-gaap_ProductWarrantyAccrual	$ 2,073,000us-gaap_ProductWarrantyAccrual	$ 1,670,000us-gaap_ProductWarrantyAccrual
Accrued warranty	2,287,310	1,337,717
Energy [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding		$ 13,000,000

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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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