Summary of Significant Accounting Policies Summary of Restricted Cash (Details) (USD $)	Nov. 30, 2013	Feb. 28, 2013
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 2,816,000	$ 1,426,000
Nonrecourse Notes
Cash and Cash Equivalents [Line Items]
Restricted cash	700,000	1,400,000
Sprint/NextRadio Agreement
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 2,100,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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