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Subsequent Event (Details) (Subsequent event [Member], Jowein building in Brooklyn, New York [Member], USD $) | 1 Months Ended
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May 31, 2015 sqft
Subsequent event [Member] | Jowein building in Brooklyn, New York [Member] |
Subsequent Event [Line Items] |
Term of lease | 20 years
Office space (in square feet) | 17,425us-gaap_AreaOfLand / mays_MortgagesPropertyAxis = mays_JoweinBuildingInBrooklynNewYorkMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Rent | $ 550,000us-gaap_LeaseAndRentalExpense / mays_MortgagesPropertyAxis = mays_JoweinBuildingInBrooklynNewYorkMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Brokerage commissions | 500,000us-gaap_LeasingCommissionsExpense / mays_MortgagesPropertyAxis = mays_JoweinBuildingInBrooklynNewYorkMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Construction costs | $ 2,000,000us-gaap_ConstructionAndDevelopmentCosts / mays_MortgagesPropertyAxis = mays_JoweinBuildingInBrooklynNewYorkMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Represents the term period of lease agreement. + References No definition available. + Details
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Namespace Prefix: | mays_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate costs related to construction and development services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_ConstructionAndDevelopmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of commissions expense incurred because the lessor of real estate obtained a lessee for a rental property through a real estate agent. + References No definition available. + Details
Name: | us-gaap_LeasingCommissionsExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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