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

No definition available.

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

- Details

Name:	nrci_Note7ShareBasedCompensationDetailsLineItems
Namespace Prefix:	nrci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of nonvested restricted shares outstanding.

+ References

No definition available.

+ Details

Name:	nrci_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedRestrictedStockOutstandingNumber
Namespace Prefix:	nrci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted for plan to date.

+ References

No definition available.

+ Details

Name:	nrci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsCumulative
Namespace Prefix:	nrci_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options which vested during the period.

+ References

No definition available.

+ Details

Name:	nrci_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsPeriodVestedAggregateIntrinsicValue
Namespace Prefix:	nrci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Name:	nrci_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionTerm
Namespace Prefix:	nrci_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

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

- 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

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

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ 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 (j)

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

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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

- 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

+ Details

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

- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ 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 (d)(2)

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

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)

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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
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

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

- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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

Note 7 - Share-Based Compensation (Details) (USD $)	12 Months Ended
Note 7 - Share-Based Compensation (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 7 - Share-Based Compensation (Details) [Line Items]
Proceeds from Stock Options Exercised (in Dollars)	$ 840,000	$ 1,283,000	$ 568,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options (in Dollars)	753,000	2,000,000	350,000
Employee Stock Option [Member] \| Common Class A [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	729,000
Employee Stock Option [Member] \| Common Class B [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	122,000
Employee Stock Option [Member] \| Common Class A and Class B [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 138 days
Employee Stock Option [Member] \| The 2001 Equity Incentive Plan [Member] \| Minimum [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Employee Stock Option [Member] \| The 2001 Equity Incentive Plan [Member] \| Maximum [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Employee Stock Option [Member] \| 2004 Director Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction Vesting Period	1 year
Nonvested [Member] \| Common Class A [Member] \| The 2006 Equity Incentive Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross			118,503
Share Based Compensation Arrangement By Share Based Payment Award, Nonvested Restricted Stock, Outstanding, Number	60,609
Nonvested [Member] \| Common Class A [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		23,469
Nonvested [Member] \| Common Class B [Member] \| The 2006 Equity Incentive Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross			19,751
Share Based Compensation Arrangement By Share Based Payment Award, Nonvested Restricted Stock, Outstanding, Number	10,101
Nonvested [Member] \| Common Class B [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		3,912
Nonvested [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	340,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 193 days
Allocated Share-based Compensation Expense (in Dollars)	140,000	74,000	143,000
Nonvested [Member] \| Minimum [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Nonvested [Member] \| Maximum [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Common Class A [Member] \| The 2001 Equity Incentive Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,800,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants, Cumulative	1,683,309
Common Class A [Member] \| 2004 Director Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants, Cumulative	1,395,000
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	1,650,000
Common Stock Options Granted To Directors	36,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	255,000
Common Class A [Member] \| The 2006 Equity Incentive Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,800,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants, Cumulative	766,545
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,033,455
Common Class A [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	232,344	238,890	498,024
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)	1,126,000	5,600,000	900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Period Vested, Aggregate Intrinsic Value (in Dollars)	1,500,000	2,300,000	1,300,000
Common Class B [Member] \| The 2001 Equity Incentive Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants, Cumulative	280,552
Common Class B [Member] \| 2004 Director Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants, Cumulative	232,500
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	275,000
Common Stock Options Granted To Directors	6,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	42,500
Common Class B [Member] \| The 2006 Equity Incentive Plan [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants, Cumulative	127,758
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	172,242
Common Class B [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	38,718	39,815	83,004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)	992,000	941,000	150,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Period Vested, Aggregate Intrinsic Value (in Dollars)	$ 500,000	$ 376,000	$ 224,000
Common Class A and Class B [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 3.24	$ 2.43	$ 2.12
The 2001 Equity Incentive Plan [Member] \| Minimum [Member]
Note 7 - 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 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award Option Term	10 years
2004 Director Plan [Member] \| Normal Term [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction Option Terms	10 years
2004 Director Plan [Member] \| Termination of Service [Member]
Note 7 - Share-Based Compensation (Details) [Line Items]
Share-based Goods and Nonemployee Services Transaction Option Terms	3 years
The 2006 Equity Incentive Plan [Member] \| Minimum [Member]
Note 7 - 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 7 - Share-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award Option Term	10 years