2.4.0.80605 - Disclosure - Liabilities Subordinated to Claims of General Creditors (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$BalanceAsOf_28Jun2013http://www.sec.gov/CIK0000815917instant2013-06-28T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$BalanceAsOf_31Dec2012http://www.sec.gov/CIK0000815917instant2012-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 4jnfc_PartnershipLiabilitiesSubordinatedToClaimsOfGeneralCreditorsAbstractjnfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Partnership's liabilities subordinated to claims of general creditors2false 5us-gaap_SubordinatedDebtus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse5000000050000USD$falsetruefalse2truefalsefalse100000000100000USD$falsetruefalsexbrli:monetaryItemTypemonetaryIncluding the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). 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