XML 36 R21.htm IDEA: XBRL DOCUMENT
v3.21.1

ROYALTY AGREEMENT (Details) - Cyprus NMC | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) $ / T | Jan. 31, 2021 USD ($) $ / T | Dec. 31, 2020 USD ($) $ / T | Dec. 31, 2019 USD ($) $ / T
ROYALTY AGREEMENT |  |  |  |
Adjusted threshold price (in dollars per ton) |  |  | 57.85 | 56.93
Maximum |  |  |  |
ROYALTY AGREEMENT |  |  |  |
Period for payments of overriding royalties on product shipments |  | 30 days |  |
Minimum |  |  |  |
ROYALTY AGREEMENT |  |  |  |
Adjusted threshold price (in dollars per ton) |  | 30 |  |
Advance royalty threshold | $ |  | $ 500,000 | $ 964,659 | $ 949,295
Forecast [Member] |  |  |  |
ROYALTY AGREEMENT |  |  |  |
Adjusted threshold price (in dollars per ton) | 58.58 |  |  |
Forecast [Member] | Minimum |  |  |  |
ROYALTY AGREEMENT |  |  |  |
Advance royalty threshold | $ | $ 976,765 |  |  |

X
- Definition Represents the adjusted threshold price per ton as per the collaborative agreement. + References No definition available. + Details
Name: | msb_CollaborativeArrangementAdjustedThresholdPricePerTon
Namespace Prefix: | msb_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum advance royalty to be received by the entity on a quarterly basis under the assignment agreement. This amount consists of an annual amount adjusted for inflation and deflation. + References No definition available. + Details
Name: | msb_CollaborativeArrangementAdvanceRoyaltyThreshold
Namespace Prefix: | msb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the period within which the related party is obligated to make payments of overriding royalties on product shipments, following the calendar quarter in which such shipments occur, as per the collaborative agreement. + References No definition available. + Details
Name: | msb_CollaborativeArrangementObligationToMakePaymentsOfOverridingRoyaltiesOnShipmentProductsPeriod
Namespace Prefix: | msb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=msb_CyprusNorthshoreMiningCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |