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Share-based Payments - Other Equity Share Units Granted (Details) Details 96 false false R97.htm 096 - Disclosure - Note 13 - Net Foreign Exchange Gain (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-13-net-foreign-exchange-gain-details-textual Note 13 - Net Foreign Exchange Gain (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-13-net-foreign-exchange-gain-tables 97 false false R98.htm 097 - Disclosure - Note 13 - Net Foreign Exchange Gain - Foreign Exchange Gain (Loss) (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-13-net-foreign-exchange-gain-foreign-exchange-gain-loss-details Note 13 - Net Foreign Exchange Gain - Foreign Exchange Gain (Loss) (Details) Details 98 false false R99.htm 098 - Disclosure - Note 14 - Derivative Financial Instruments (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-14-derivative-financial-instruments-details-textual Note 14 - Derivative Financial Instruments (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-14-derivative-financial-instruments-tables 99 false false R100.htm 099 - Disclosure - Note 14 - Derivative Financial Instruments - Fair Value Losses on Derivative assets (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-14-derivative-financial-instruments-fair-value-losses-on-derivative-assets-details Note 14 - Derivative Financial Instruments - Fair Value Losses on Derivative assets (Details) Details 100 false false R101.htm 100 - Disclosure - Note 14 - Derivative Financial Instruments - Derivative Financial Assets (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-14-derivative-financial-instruments-derivative-financial-assets-details Note 14 - Derivative Financial Instruments - Derivative Financial Assets (Details) Details 101 false false R102.htm 101 - Disclosure - Note 14 - Derivative Financial Instruments - Derivative Financial Liabilities (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-14-derivative-financial-instruments-derivative-financial-liabilities-details Note 14 - Derivative Financial Instruments - Derivative Financial Liabilities (Details) Details 102 false false R103.htm 102 - Disclosure - Note 14 - Derivative Financial Instruments - Allocation of Proceeds Received (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-14-derivative-financial-instruments-allocation-of-proceeds-received-details Note 14 - Derivative Financial Instruments - Allocation of Proceeds Received (Details) Details 103 false false R104.htm 103 - Disclosure - Note 15 - Leases (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-15-leases-details-textual Note 15 - Leases (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-15-leases-tables 104 false false R105.htm 104 - Disclosure - Note 15 - Leases - Right of Use Assets (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-15-leases-right-of-use-assets-details Note 15 - Leases - Right of Use Assets (Details) Details 105 false false R106.htm 105 - Disclosure - Note 15 - Leases - Lease Liabilities (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-15-leases-lease-liabilities-details Note 15 - Leases - Lease Liabilities (Details) Details 106 false false R107.htm 106 - Disclosure - Note 15 - Leases - Financial Statement Amounts (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-15-leases-financial-statement-amounts-details Note 15 - Leases - Financial Statement Amounts (Details) Details 107 false false R108.htm 107 - Disclosure - Note 15 - Leases - Minimum Lease Payments (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-15-leases-minimum-lease-payments-details Note 15 - Leases - Minimum Lease Payments (Details) Details 108 false false R109.htm 108 - Disclosure - Note 16 - Finance Income and Finance Cost (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-16-finance-income-and-finance-cost-details-textual Note 16 - Finance Income and Finance Cost (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-16-finance-income-and-finance-cost-tables 109 false false R110.htm 109 - Disclosure - Note 16 - Finance Income and Finance Costs - Components of Finance Income and Costs (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-16-finance-income-and-finance-costs-components-of-finance-income-and-costs-details Note 16 - Finance Income and Finance Costs - Components of Finance Income and Costs (Details) Details 110 false false R111.htm 110 - Disclosure - Note 17 - Tax Expense (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-details-textual Note 17 - Tax Expense (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-tables 111 false false R112.htm 111 - Disclosure - Note 17 - Tax Expense - Income Tax Components (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-income-tax-components-details Note 17 - Tax Expense - Income Tax Components (Details) Details 112 false false R113.htm 112 - Disclosure - Note 17 - Tax Expense - Unrecognised Deferred Tax Assets (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-unrecognised-deferred-tax-assets-details Note 17 - Tax Expense - Unrecognised Deferred Tax Assets (Details) Details 113 false false R114.htm 113 - Disclosure - Note 17 - Tax Expense - Tax Paid (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-tax-paid-details Note 17 - Tax Expense - Tax Paid (Details) Details 114 false false R115.htm 114 - Disclosure - Note 17 - Tax Expense - Reconciliation of Tax Rate (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-reconciliation-of-tax-rate-details Note 17 - Tax Expense - Reconciliation of Tax Rate (Details) Details 115 false false R116.htm 115 - Disclosure - Note 17 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-recognised-deferred-tax-assets-and-liabilities-details Note 17 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) Details 116 false false R117.htm 116 - Disclosure - Note 17 - Tax Expense - Movement in Recognised Deferred Tax Assets and Liabilities (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-17-tax-expense-movement-in-recognised-deferred-tax-assets-and-liabilities-details Note 17 - Tax Expense - Movement in Recognised Deferred Tax Assets and Liabilities (Details) Details 117 false false R118.htm 117 - Disclosure - Note 18 - Property, Plant and Equipment (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-18-property-plant-and-equipment-details-textual Note 18 - Property, Plant and Equipment (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-18-property-plant-and-equipment-tables 118 false false R119.htm 118 - Disclosure - Note 18 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-18-property-plant-and-equipment-reconciliation-of-changes-in-property-plant-and-equipment-details Note 18 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) Details 119 false false R120.htm 119 - Disclosure - Note 19 - Exploration and Evaluation Assets (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-19-exploration-and-evaluation-assets-details-textual Note 19 - Exploration and Evaluation Assets (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-19-exploration-and-evaluation-assets-tables 120 false false R121.htm 120 - Disclosure - Note 19 - Exploration and Evaluation Assets - Exploration and Evaluation Assets (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-19-exploration-and-evaluation-assets-exploration-and-evaluation-assets-details Note 19 - Exploration and Evaluation Assets - Exploration and Evaluation Assets (Details) Details 121 false false R122.htm 121 - Disclosure - Note 20 - Inventories - Components of Inventory (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-20-inventories-components-of-inventory-details Note 20 - Inventories - Components of Inventory (Details) Details 122 false false R123.htm 122 - Disclosure - Note 21 - Prepayments - Prepayments (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-21-prepayments-prepayments-details Note 21 - Prepayments - Prepayments (Details) Details 123 false false R124.htm 123 - Disclosure - Note 22 - Cash and Cash Equivalents - Components of Cash and Cash Equivalents (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-22-cash-and-cash-equivalents-components-of-cash-and-cash-equivalents-details Note 22 - Cash and Cash Equivalents - Components of Cash and Cash Equivalents (Details) Details 124 false false R125.htm 124 - Disclosure - Note 22 - Cash and Cash Equivalents - Exposure to Risk (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-22-cash-and-cash-equivalents-exposure-to-risk-details Note 22 - Cash and Cash Equivalents - Exposure to Risk (Details) Details 125 false false R126.htm 125 - Disclosure - Note 23 - Assets Held for Sale (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-23-assets-held-for-sale-details-textual Note 23 - Assets Held for Sale (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-23-assets-held-for-sale-tables 126 false false R127.htm 126 - Disclosure - Note 23 - Assets Held for Sale - Noncurrent Assets Held for Sale (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-23-assets-held-for-sale-noncurrent-assets-held-for-sale-details Note 23 - Assets Held for Sale - Noncurrent Assets Held for Sale (Details) Details 127 false false R128.htm 127 - Disclosure - Note 23 - Assets Held for Sale - Disposal of Assets Held For Sale (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-23-assets-held-for-sale-disposal-of-assets-held-for-sale-details Note 23 - Assets Held for Sale - Disposal of Assets Held For Sale (Details) Details 128 false false R129.htm 128 - Disclosure - Note 24 - Trade and Other Receivables - Components of Trade and Other Receivables (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-24-trade-and-other-receivables-components-of-trade-and-other-receivables-details Note 24 - Trade and Other Receivables - Components of Trade and Other Receivables (Details) Details 129 false false R130.htm 129 - Disclosure - Note 25 - Share Capital (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-25-share-capital-details-textual Note 25 - Share Capital (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-25-share-capital-tables 130 false false R131.htm 130 - Disclosure - Note 25 - Share Capital - Issued Ordinary Shares (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-25-share-capital-issued-ordinary-shares-details Note 25 - Share Capital - Issued Ordinary Shares (Details) Details 131 false false R132.htm 131 - Disclosure - Note 26 - Reserves - Reserves in Equity (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-26-reserves-reserves-in-equity-details Note 26 - Reserves - Reserves in Equity (Details) Details 132 false false R133.htm 132 - Disclosure - Note 27 - Earnings Per Share (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-27-earnings-per-share-details-textual Note 27 - Earnings Per Share (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-27-earnings-per-share-tables 133 false false R134.htm 133 - Disclosure - Note 27 - Earnings Per Share - Earnings Per Share Computations (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-27-earnings-per-share-earnings-per-share-computations-details Note 27 - Earnings Per Share - Earnings Per Share Computations (Details) Details 134 false false R135.htm 134 - Disclosure - Note 28 - Non-controlling Interests (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-28-noncontrolling-interests-details-textual Note 28 - Non-controlling Interests (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-28-noncontrolling-interests-tables 135 false false R136.htm 135 - Disclosure - Note 28 - Non-controlling Interests - Schedule of Non-controlling Interests (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-28-noncontrolling-interests-schedule-of-noncontrolling-interests-details Note 28 - Non-controlling Interests - Schedule of Non-controlling Interests (Details) Details 136 false false R137.htm 136 - Disclosure - Note 29 - Provisions (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-29-provisions-details-textual Note 29 - Provisions (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-29-provisions-tables 137 false false R138.htm 137 - Disclosure - Note 29 - Provisions - Reconciliation of Site Restoration Provision (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-29-provisions-reconciliation-of-site-restoration-provision-details Note 29 - Provisions - Reconciliation of Site Restoration Provision (Details) Details 138 false false R139.htm 138 - Disclosure - Note 30 - Loans and Borrowings - Loans (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-30-loans-and-borrowings-loans-details Note 30 - Loans and Borrowings - Loans (Details) Details 139 false false R140.htm 139 - Disclosure - Note 30 - Loans and Borrowings - Terms and Repayment Schedule (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-30-loans-and-borrowings-terms-and-repayment-schedule-details Note 30 - Loans and Borrowings - Terms and Repayment Schedule (Details) Details 140 false false R141.htm 140 - Disclosure - Note 31 - Trade and Other Payables - Components (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-31-trade-and-other-payables-components-details Note 31 - Trade and Other Payables - Components (Details) Details 141 false false R142.htm 141 - Disclosure - Note 32 - Cash Flow Information - Non-cash Items and Information (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-32-cash-flow-information-noncash-items-and-information-details Note 32 - Cash Flow Information - Non-cash Items and Information (Details) Details 142 false false R143.htm 142 - Disclosure - Note 33 - Financial Instruments and Risk Management - Credit Risk (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-33-financial-instruments-and-risk-management-credit-risk-details Note 33 - Financial Instruments and Risk Management - Credit Risk (Details) Details 143 false false R144.htm 143 - Disclosure - Note 33 - Financial Instruments and Risk Management - Non-derivative Financial Liabilities Liquidity Risk (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-33-financial-instruments-and-risk-management-nonderivative-financial-liabilities-liquidity-risk-details Note 33 - Financial Instruments and Risk Management - Non-derivative Financial Liabilities Liquidity Risk (Details) Details 144 false false R145.htm 144 - Disclosure - Note 33 - Financial Instruments and Risk Management - Exposure to Risk (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-33-financial-instruments-and-risk-management-exposure-to-risk-details Note 33 - Financial Instruments and Risk Management - Exposure to Risk (Details) Details 145 false false R146.htm 145 - Disclosure - Note 33 - Financial Instruments and Risk Management - Sensitivity Analysis on Derivative Financial Liabilities Market Risk (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-33-financial-instruments-and-risk-management-sensitivity-analysis-on-derivative-financial-liabilities-market-risk-details Note 33 - Financial Instruments and Risk Management - Sensitivity Analysis on Derivative Financial Liabilities Market Risk (Details) Details 146 false false R147.htm 146 - Disclosure - Note 34 - Dividends - Dividends Paid (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-34-dividends-dividends-paid-details Note 34 - 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Disclosure - Note 37 - Group Entities (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-37-group-entities-details-textual Note 37 - Group Entities (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-37-group-entities-tables 151 false false R152.htm 151 - Disclosure - Note 37 - Group Entities - Subsidiaries of the Company (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-37-group-entities-subsidiaries-of-the-company-details Note 37 - Group Entities - Subsidiaries of the Company (Details) Details 152 false false R153.htm 152 - Disclosure - Note 38 - Operating Segments (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-38-operating-segments-details-textual Note 38 - Operating Segments (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-38-operating-segments-tables 153 false false R154.htm 153 - Disclosure - Note 38 - Operating Segments - Financial Statements (Details) Sheet http://www.caledoniamining.com/20211231/role/statement-note-38-operating-segments-financial-statements-details Note 38 - Operating Segments - Financial Statements (Details) Details 154 false false R155.htm 154 - Disclosure - Note 39 - Defined Contribution Plan (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-39-defined-contribution-plan-details-textual Note 39 - Defined Contribution Plan (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-39-defined-contribution-plan 155 false false R156.htm 155 - Disclosure - Note 40 - COVID-19 (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-40-covid19-details-textual Note 40 - COVID-19 (Details Textual) Details http://www.caledoniamining.com/20211231/role/statement-note-40-covid19 156 false false R157.htm 156 - Disclosure - Note 41 - Subsequent Events (Details Textual) Sheet http://www.caledoniamining.com/20211231/role/statement-note-41-subsequent-events-details-textual Note 41 - 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