2.4.0.8128 - Disclosure - Property, Net (Details Textual)truefalsefalse1false USDfalsefalse$P03_01_2011To02_29_2012_SpectrumInformalAgreementMemberusgaapRelatedPartyTransactionsByRelatedPartyAxishttp://www.sec.gov/CIK0000764630duration2011-03-01T00:00:002012-02-29T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false USDtruefalse$P03_01_2011To02_29_2012_SpectrumInformalAgreementMemberusgaapRelatedPartyTransactionsByRelatedPartyAxishttp://www.sec.gov/CIK0000764630duration2011-03-01T00:00:002012-02-29T00:00:00falsefalseSpectrum Informal Agreement [Member]us-gaap_RelatedPartyTransactionsByRelatedPartyAxisxbrldihttp://xbrl.org/2006/xbrldiusbl_SpectrumInformalAgreementMemberus-gaap_RelatedPartyTransactionsByRelatedPartyAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Spectrum Informal Agreement [Member]2false 4us-gaap_ProceedsFromRentsReceivedus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1200012000USD$falsetruefalsexbrli:monetaryItemTypemonetaryCash received for rents during the current period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 false2Proceeds from Rents Received3false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalse$P03_01_2011To02_29_2012_TenantMemberusgaapRelatedPartyTransactionsByRelatedPartyAxishttp://www.sec.gov/CIK0000764630duration2011-03-01T00:00:002012-02-29T00:00:00falsefalseTenant [Member]us-gaap_RelatedPartyTransactionsByRelatedPartyAxisxbrldihttp://xbrl.org/2006/xbrldiusbl_TenantMemberus-gaap_RelatedPartyTransactionsByRelatedPartyAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Tenant [Member]4false 4us-gaap_ProceedsFromRentsReceivedus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse30003000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCash received for rents during the current period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 false2Proceeds from Rents Received5false 4usbl_OptionsToRenewLeaseAtEachMonthlyRatesYearOneusbl_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse31503150USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount refers to the options to renew lease at monthly rate which is avail by tenant for year one.No definition available.false2Options To Renew Lease At Each Monthly Rates Year One6false 4usbl_OptionsToRenewLeaseAtEachMonthlyRatesYearTwousbl_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse33003300USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount refers to the options to renew lease at monthly rate which is avail by tenant for year two.No definition available.false2Options To Renew Lease At Each Monthly Rates Year TwofalseProperty, Net (Details Textual) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.usbl.com/role/PropertyNetDetailsTextual16