Amortization period.

No definition available.

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Period Type:	duration

- Definition

Debt instrument, date to be repaid, replaced, or extended.

+ References

No definition available.

+ Details

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Namespace Prefix:	emms_
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Balance Type:	na
Period Type:	duration

- Definition

Fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	emms_FixedChargeCoverageRatio
Namespace Prefix:	emms_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of loan agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	emms_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of ownership interest on mortgage property.

+ References

No definition available.

+ Details

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Namespace Prefix:	emms_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Payment of income tax obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	emms_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Subsequent Events - Additional Information (Details)		12 Months Ended
Subsequent Events - Additional Information (Details)	Apr. 12, 2019 USD ($) a Station Agreement	Feb. 28, 2019 USD ($)	Feb. 28, 2018 USD ($)	Feb. 28, 2017 USD ($)	May 30, 2012 USD ($)
Subsequent Event [Line Items]
Face amount of debt		$ 10,200,000	$ 10,200,000		$ 82,200,000
Interest expense		$ 8,103,000	$ 15,143,000	$ 18,018,000
Subsequent Event
Subsequent Event [Line Items]
Number of loan agreement \| Agreement	3
Payment of income tax obligation	$ 7,000,000
Subsequent Event \| Mortgage
Subsequent Event [Line Items]
Fixed charge coverage ratio	1.10
Debt instrument expiration date	Apr. 12, 2029
Debt instrument, interest rate, stated percentage	5.48%
Amortization period	25 years
Subsequent Event \| Mortgage \| Whitestown, Indiana
Subsequent Event [Line Items]
Area of land \| a	70
Subsequent Event \| Star Financial Bank \| Mortgage
Subsequent Event [Line Items]
Face amount of debt	$ 23,000,000
Subsequent Event \| Revolving Credit Agreement
Subsequent Event [Line Items]
Credit agreement expiration date	Apr. 12, 2024
Commitment fee percentage	0.50%
Fixed charge coverage ratio	1.10
Subsequent Event \| Revolving Credit Agreement \| 3 Month LIBOR Member
Subsequent Event [Line Items]
Basis spread on interest rate	2.50%
Subsequent Event \| Revolving Credit Agreement \| Wells Fargo Bank, National Association
Subsequent Event [Line Items]
Face amount of debt	$ 12,000,000
Subsequent Event \| Term Loan
Subsequent Event [Line Items]
Debt instrument, date to be repaid, replaced, or extended	Oct. 12, 2021
Debt instrument expiration date	Apr. 12, 2022
Debt instrument, interest rate, stated percentage	10.00%
Subsequent Event \| Term Loan \| Minimum
Subsequent Event [Line Items]
Interest expense	$ 125,000
Subsequent Event \| Term Loan \| Austin, Texas
Subsequent Event [Line Items]
Number of ownership interest on mortgage property \| Station	6
Subsequent Event \| Term Loan \| Barrett Investment Partners, LLC
Subsequent Event [Line Items]
Face amount of debt	$ 4,000,000
Subsequent Event \| Term Loan \| Interest Rate Second Year
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage	12.00%
Subsequent Event \| Term Loan \| Interest Rate Third Year
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage	14.00%