Gross number of share options (or share units) expected to be granted to Directors after each year's annual meeting.

No definition available.

Name:	nrci_CommonStockOptionsGrantedToDirectors
Namespace Prefix:	nrci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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- Definition

Reflects the number of years from grant to when the share-based award expires as specified in the award agreement

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Reflects the number of years from grant to when the share-based award expires as specified in the award agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	nrci_
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- Definition

Description of the period of time over which an employee's or nonemployee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

No definition available.

+ Details

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Namespace Prefix:	nrci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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Balance Type:	na
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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

- Definition

The maximum number of shares (or other type of equity) that have been approved for issuance in the equity-based payment transaction.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 50

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

Note 5 - Share-Based Compensation (Details) (USD $)	9 Months Ended
Note 5 - Share-Based Compensation (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Normal Term [Member] \| 2004 Director Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction Option Terms	10 years
Termination of Service [Member] \| 2004 Director Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction Option Terms	3 years
Options Vesting One To Five Years [Member] \| The 2001 Equity Incentive Plan [Member] \| Minimum [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Options Vesting One To Five Years [Member] \| The 2001 Equity Incentive Plan [Member] \| Maximum [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
2004 Director Plan [Member] \| Common Class A [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	1,650,000
Common Stock Options Granted To Directors	36,000
2004 Director Plan [Member] \| Common Class B [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	275,000
Common Stock Options Granted To Directors	6,000
Nonvested [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	$ 375,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 281 days
Common Class A [Member] \| The 2001 Equity Incentive Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,800,000
Common Class A [Member] \| The 2006 Equity Incentive Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,800,000
Common Class A [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	232,344	238,890
Common Class B [Member] \| The 2001 Equity Incentive Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Common Class B [Member] \| The 2006 Equity Incentive Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Common Class B [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	38,718	39,815
The 2001 Equity Incentive Plan [Member] \| Minimum [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award Option Term	5 years
The 2001 Equity Incentive Plan [Member] \| Maximum [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award Option Term	10 years
2004 Director Plan [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction Vesting Period	1 year
The 2006 Equity Incentive Plan [Member] \| Minimum [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award Option Term	5 years
The 2006 Equity Incentive Plan [Member] \| Maximum [Member]
Note 5 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award Option Term	10 years