Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended	33 Months Ended
Dec. 31, 2012 item	Dec. 31, 2010 item
Number of master loan agreements	2
Non-cash advance	$ 3,300,000
Loan agreement restrictions, maximum dividends in any year	2,050,000
Leverage ratio of indebtedness to EBITDA, expressed as a percentage	350.00%
Debt instrument, subject to fixed interest rates	36,000,000
Weighted average rate	5.52%
Debt instrument, subject to variable interest rates	14,400,000
Debt instrument, subject to variable interest rates, credit facilities	3,800,000
Debt instrument, subject to variable interest rates, current outstanding	10,600,000
Effective weighted average rate	2.63%
Secured Debt [Member] \| Master Loan Agreements [Member]
Debt instrument, face amount	59,700,000
Additional borrowings	4,500,000
Secured Debt [Member] \| MLA RX0583-T1 [Member]
Debt instrument, face amount	15,000,000
Number of quarterly principal payments	16	12
Debt instrument, periodic principal payment	250,000	125,000
Debt instrument, final balloon payment	9,500,000
Secured Debt [Member] \| MLA RX0583-T2 [Member]
Debt instrument, face amount	10,000,000
Current amount drawn on revolving note	8,221,385
Secured Debt [Member] \| MLA RX0583-T3 [Member]
Debt instrument, face amount	4,500,000
Number of quarterly principal payments	7
Debt instrument, periodic principal payment	225,000
Debt instrument, final balloon payment	2,925,000
Secured Debt [Member] \| MLA RX0583-T1 And MLA RX0583-T2 [Member]
Percent over the applicable LIBOR rate	2.50%
Secured Debt [Member] \| MLA RX0583 [Member]
Percent over the applicable LIBOR rate	3.00%
Secured Debt [Member] \| MLA RX0584-T1 [Member]
Debt instrument, face amount	29,700,000
Number of quarterly principal payments	20
Debt instrument, periodic principal payment	609,500
Debt instrument, final balloon payment	17,510,000
Secured Debt [Member] \| MLA RX0584-T2 [Member]
Debt instrument, face amount	2,000,000
Secured Debt [Member] \| MLA RX0584-T3 [Member]
Debt instrument, face amount	$ 3,000,000
Secured Debt [Member] \| MLA RX0584 [Member]
Percent over the applicable LIBOR rate	2.75%

Debt instrument, final balloon payment

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Noncash Advance

+ References

No definition available.

+ Details

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Namespace Prefix:	nulm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt instrument, subject to fixed interest rates

+ References

No definition available.

+ Details

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Namespace Prefix:	nulm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument, subject to variable interest rates

+ References

No definition available.

+ Details

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Namespace Prefix:	nulm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument, subject to variable interest rates, credit facilities

+ References

No definition available.

+ Details

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Namespace Prefix:	nulm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument, subject to variable interest rates, current outstanding

+ References

No definition available.

+ Details

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Namespace Prefix:	nulm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Leverage ratio of indebtedness to EBITDA, expressed as a percentage

+ References

No definition available.

+ Details

Name:	nulm_LeverageRatioOfIndebtednessToEbitdaExpressedAsPercentage
Namespace Prefix:	nulm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Loan agreement restrictions, maximum dividends in any year

+ References

No definition available.

+ Details

Name:	nulm_LoanAgreementRestrictionsMaximumDividendsInAnyYear
Namespace Prefix:	nulm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Long-term debt, effective weighted average interest rate

+ References

No definition available.

+ Details

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

- Definition

Number of master loan agreements

+ References

No definition available.

+ Details

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

- Definition

Number of quarterly principal payments

+ References

No definition available.

+ Details

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

- Definition

The 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:	instant

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-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.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Increase of additional borrowings on existing and new debt instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

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Balance Type:	credit
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- Definition

Amount of the required periodic payments applied to principal.

+ 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: 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

Reference 2: 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 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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time.

+ References

No definition available.

+ Details

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