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14. Acquisition Gf&h Company (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014
Details |
Business Acquisition, Cost of Acquired Entity, Cash Paid | $ 100,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Subsidiary expenses, detail | $ 2,577 njmc_SubsidiaryExpensesDetail

X
- Definition Subsidiary expenses, detail + References No definition available. + Details
Name: | njmc_SubsidiaryExpensesDetail
Namespace Prefix: | njmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash paid to acquire the entity. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration