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Note 12 - Commitments and Contingencies (Details) (USD $)	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Mortgage Loans Repurchased Amount	$ 0

X

- Definition

Mortgage loans repurchased amount during period.

+ References

No definition available.

+ Details

Name:	nymt_MortgageLoansRepurchasedAmount
Namespace Prefix:	nymt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration