Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 899,283	$ 712,197
United States Treasury securities (Note 4)	7,535,178us-gaap_HeldToMaturitySecuritiesCurrent	5,468,675us-gaap_HeldToMaturitySecuritiesCurrent
Royalties receivable	2,959,038us-gaap_ReceivablesNetCurrent	4,448,907us-gaap_ReceivablesNetCurrent
Prepaid expenses	2,110us-gaap_PrepaidInsurance	2,110us-gaap_PrepaidInsurance
TOTAL CURRENT ASSETS	11,395,609us-gaap_AssetsCurrent	10,631,889us-gaap_AssetsCurrent
NONCURRENT ASSETS
United States Treasury securities (Note 4)		2,883,251
Prepaid pension costs (Note 7)		587,159
TOTAL NONCURRENT ASSETS		3,470,410us-gaap_OtherAssetsNoncurrent
PROPERTIES
Mineral and surface lands (Notes 4 and 5)	39,479,708us-gaap_MineralPropertiesGross	39,479,708us-gaap_MineralPropertiesGross
Accumulated depletion and amortization	(39,288,577)	(38,592,577)
Mineral and surface lands, net	191,131us-gaap_MineralPropertiesNet	887,131us-gaap_MineralPropertiesNet
Building and equipment	335,767us-gaap_PropertyPlantAndEquipmentGross	335,767us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(317,865)	(263,965)
Building and equipment, net	17,902us-gaap_PropertyPlantAndEquipmentNet	71,802us-gaap_PropertyPlantAndEquipmentNet
TOTAL PROPERTIES	209,033gni_TotalProperties	958,933gni_TotalProperties
TOTAL ASSETS	11,604,642us-gaap_Assets	15,061,232us-gaap_Assets
CURRENT LIABILITIES
Accounts payable and accrued expenses	287,934	92,356
Deferred compensation	270,300
Distributions	3,000,000us-gaap_DividendsPayableCurrent	3,975,000us-gaap_DividendsPayableCurrent
TOTAL CURRENT LIABILITIES	3,558,234us-gaap_LiabilitiesCurrent	4,067,356us-gaap_LiabilitiesCurrent
NONCURRENT LIABILITIES
Deferred compensation		244,300
Liability for pension benefits (Note 7)	978,566
TOTAL NONCURRENT LIABILITIES	978,566us-gaap_LiabilitiesNoncurrent	244,300us-gaap_LiabilitiesNoncurrent
TOTAL LIABILITIES	4,536,800us-gaap_Liabilities	4,311,656us-gaap_Liabilities
Certificate holders' equity, represented by 1,500,000 certificates (shares or units) of beneficial interest authorized and outstanding, and the reversionary interest (Notes 2 and 6)	10,710,020us-gaap_CommonStockValue	11,611,487us-gaap_CommonStockValue
Accumulated other comprehensive loss (Notes 7 and 11)	(3,642,178)	(861,911)
TOTAL BENEFICIARIES' EQUITY	7,067,842us-gaap_StockholdersEquity	10,749,576us-gaap_StockholdersEquity
TOTAL LIABILITIES AND BENEFICIARIES' EQUITY	$ 11,604,642	$ 15,061,232

Total mineral properties and property, plant, and equipment.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3,4)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 4.E)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section E

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.29-31)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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