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Long-Term Debt - Mortgages (Narrative) (Details) (USD $) | 1 Months Ended | 0 Months Ended |
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Aug. 19, 2004 | Jan. 09, 2015 | Apr. 30, 2015
Fishkill, New York Property [Member] |  |  |
Closed bank liabilities | $ 12,000,000mays_ClosedBankLiabilities / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember |  |
Interest rate, percent |  |  | 6.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember
Bond St. Building, Brooklyn, N Y [Member] |  |  |
Interest rate, percent |  |  | 6.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYMember
Bond St. building, Brooklyn, NY [Member] |  |  |
Refinanced amount |  | 6,000,000mays_LongTermDebtRefinancedAmount / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember |
Amount outstanding |  | 5,347,726us-gaap_DebtInstrumentCarryingAmount / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember |
Additional borrowing |  | 652,274mays_AdditionalMortgageLoansForCapitalImprovements / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember |
Term of loan |  | 5 years |
Amortization period of loan |  | 25 years |
Interest rate, percent |  | 3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember | 3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / mays_MortgagesPropertyAxis = mays_BondSt.BuildingBrooklynNYTwoMember
Permanent Subordinate Mortgage [Member] | Fishkill, New York Property [Member] |  |  |
Secured debt | 1,870,000us-gaap_SecuredDebt / mays_LoanFinancingAxis = mays_PermanentSubordinateMortgageMember / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember |  |
Multiple Successively Subordinate Loans [Member] | Fishkill, New York Property [Member] |  |  |
Secured debt | $ 8,295,274us-gaap_SecuredDebt / mays_LoanFinancingAxis = mays_MultipleSuccessivelySubordinateLoansMember / mays_MortgagesPropertyAxis = mays_FishkillNewYorkPropertyMember |  |

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- Definition The value for additional mortgage loan for capital improvements. + References No definition available. + Details
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- Definition The amount for closed bank liabilities. + References No definition available. + Details
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- Definition Representing long term debt refinanced amount. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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