v2.4.0.8

Subsequent Events (Narrative) (Details) (Renewed Revolving Loan [Member], USD $) | 0 Months Ended
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Feb. 21, 2014
Renewed Revolving Loan [Member] |
Subsequent Event [Line Items] |
New Credit Limit | $ 40,000,000
Accordion option | 10,000,000
Modification fee for the Renewed Revolving Loan | 60,000
Interest on the advances | daily reset LIBOR rate plus 1.65%
Advances minimum amount termed out for purpose of repurchases of Company's common stock | $ 5,000,000
Interest on the termed out advances | fixed or floating basis rates predetermined by the Lender and Borrower

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- Definition Credit Agreement - Accordion Provision to increase the Credit Limit + References No definition available. + Details
Name: | nile_AccordionOption
Namespace Prefix: | nile_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Description of the interest rate for the advances under the credit facility, including the terms and the method for determining the interest rate. + References No definition available. + Details
Name: | nile_AdvancesInterestRateDescription
Namespace Prefix: | nile_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Credit Agreement - Minimum advance amount to repurchase stock of Borrower + References No definition available. + Details
Name: | nile_MinimumAdvanceAmount
Namespace Prefix: | nile_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Modification fee for Renewed Revolving Loan + References No definition available. + Details
Name: | nile_Modificationfee
Namespace Prefix: | nile_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Description of the interest rate for the termed out advances under the credit facility, including the terms and the method for determining the interest rate. + References No definition available. + Details
Name: | nile_TermedoutadvancesInterestRateDescription
Namespace Prefix: | nile_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration