Note 10 - Long-term Debt (Details) - Borrowings Under the Senior Secured Revolving Credit Facility	12 Months Ended
Dec. 31, 2015
Pricing Tier 1 [Member]
Guarantor Obligations [Line Items]
Commitment fee/unused line fee	0.45%
Letter of credit fee	2.75%
Pricing Tier 1 [Member] \| Eurodollar [Member]
Guarantor Obligations [Line Items]
Interest rate	2.75%
Pricing Tier 1 [Member] \| Base Rate [Member]
Guarantor Obligations [Line Items]
Interest rate	1.75%
Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Commitment fee/unused line fee	0.40%
Letter of credit fee	2.50%
Pricing Tier 2 [Member] \| Eurodollar [Member]
Guarantor Obligations [Line Items]
Interest rate	2.50%
Pricing Tier 2 [Member] \| Base Rate [Member]
Guarantor Obligations [Line Items]
Interest rate	1.50%
Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Commitment fee/unused line fee	0.35%
Letter of credit fee	2.25%
Pricing Tier 3 [Member] \| Eurodollar [Member]
Guarantor Obligations [Line Items]
Interest rate	2.25%
Pricing Tier 3 [Member] \| Base Rate [Member]
Guarantor Obligations [Line Items]
Interest rate	1.25%
Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Commitment fee/unused line fee	0.30%
Letter of credit fee	2.00%
Pricing Tier 4 [Member] \| Eurodollar [Member]
Guarantor Obligations [Line Items]
Interest rate	2.00%
Pricing Tier 4 [Member] \| Base Rate [Member]
Guarantor Obligations [Line Items]
Interest rate	1.00%
Pricing Tier 5 [Member]
Guarantor Obligations [Line Items]
Commitment fee/unused line fee	0.30%
Letter of credit fee	1.75%
Pricing Tier 5 [Member] \| Eurodollar [Member]
Guarantor Obligations [Line Items]
Interest rate	1.75%
Pricing Tier 5 [Member] \| Base Rate [Member]
Guarantor Obligations [Line Items]
Interest rate	0.75%
Minimum [Member] \| Pricing Tier 1 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	4.00
Minimum [Member] \| Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	3.50
Minimum [Member] \| Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	3.00
Minimum [Member] \| Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	2.50
Maximum [Member] \| Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	4.00
Maximum [Member] \| Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	3.50
Maximum [Member] \| Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	3.00
Maximum [Member] \| Pricing Tier 5 [Member]
Guarantor Obligations [Line Items]
Consolidated leverage ratio	2.50

Leverage ratio associated with a company's debt agreements.

No definition available.

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Period Type:	duration

- Definition

The fee, expressed as a percentage of the letter of credit, for available but unused credit capacity under the letter of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	exam_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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