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Earnings per Share (Narrative) (Details)	9 Months Ended
	Sep. 30, 2012
Earnings Per Share 2	6,099,550

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Earnings Per Share 2

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Name:	njmc_EarningsPerShareZeroNineFiveFourOneTwoFiveSevenThreefKSevenEightEightgCGbGg
Namespace Prefix:	njmc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration