Note 16 - Commitments and Contingencies (Details) - Future Minimum Lease Payments (USD $)	Sep. 30, 2013
Note 16 - Commitments and Contingencies (Details) - Future Minimum Lease Payments [Line Items]
2014	$ 28,250
2015	0
2016	0
Thereafter	0
	28,250
Gross Payments [Member]
Note 16 - Commitments and Contingencies (Details) - Future Minimum Lease Payments [Line Items]
2014	1,749,360
2015	1,728,190
2016	1,533,440
2017	1,323,580
Thereafter	2,118,310
	8,452,880
Net of Sublease Income [Member]
Note 16 - Commitments and Contingencies (Details) - Future Minimum Lease Payments [Line Items]
2014	1,721,110
2015	1,728,190
2016	1,533,440
2017	1,323,580
Thereafter	2,118,310
	$ 8,424,630

Name:	nhld_Note16CommitmentsandContingenciesDetailsFutureMinimumLeasePaymentsLineItems
Namespace Prefix:	nhld_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Operating leases future minimum lease payments due, future sublease rental income in four years.

+ References

No definition available.

+ Details

Name:	nhld_OperatingLeasesFutureMinimumLeasePaymentsDueFutureSubleaseRentalIncomeInFourYears
Namespace Prefix:	nhld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating leases future minimum lease payments due, future sublease rental income next twelve months.

+ References

No definition available.

+ Details

Name:	nhld_OperatingLeasesFutureMinimumLeasePaymentsDueFutureSubleaseRentalIncomeNextTwelveMonths
Namespace Prefix:	nhld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating leases future minimum lease payments due, future sublease rental income thereafter.

+ References

No definition available.

+ Details

Name:	nhld_OperatingLeasesFutureMinimumLeasePaymentsDueFutureSubleaseRentalIncomeThereafter
Namespace Prefix:	nhld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating leases future minimum lease payments due, future sublease rental income in two years.

+ References

No definition available.

+ Details

Name:	nhld_OperatingLeasesFutureMinimumLeasePaymentsDueFutureSubleaseRentalIncomeTwoYears
Namespace Prefix:	nhld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

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

- Definition

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

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

- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

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

- Definition

Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

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

- Definition

Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

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

- Definition

Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

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

- Definition

Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

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