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Note 23 - Equity-settled Share-based Expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Explanation of effect of share-based payments on entity's profit or loss [text block] |
|  | Note |  | 2017 |  |  | 2016 |  |  | 2015 |
Share option programmes |  | 23.1(a) |  |  | 29 |  |  |  | 170 |  |  |  | 24 |
Facilitation and advanced dividend loan modification |  | 23.1(b) |  |  | 806 |  |  |  | - |  |  |  | - |
|  |  |  |  | 835 |  |  |  | 170 |  |  |  | 24 |
|  | Note |  | 2017 |  |  | 2016 |  |  | 2015 |
Restricted Share units and Performance Share Units |  | 23.2(a) |  |  | 853 |  |  |  | 618 |  |  |  | - |
Caledonia Mining South Africa employee incentive scheme |  | 23.2(b) |  |  | 123 |  |  |  | - |  |  |  | - |
|  |  |  |  | 976 |  |  |  | 618 |  |  |  | - |
Disclosure of range of exercise prices of outstanding share options [text block] |
Number of Options |  |  | Exercise Price |  |  | Expiry Date
|  |  | Canadian $ |  |  |
| 5,000 |  |  |  | 4.00 |  |  | Oct 8, 2020
| 18,000 |  |  |  | 11.50 |  |  | Oct 13, 2021
| 5,000 |  |  |  | 8.10 |  |  | May 30, 2022
| 28,000 |  |  |  |  |  |  |
Disclosure of number and weighted average exercise prices of share options [text block] |
|  | Number of Options * |  |  | Weighted Avg. Exercise Price |
|  |  |  |  | Canadian $ * |
Options outstanding and exercisable at January 1, 2015 |  |  | 513,184 |  |  |  | 5.55 |
Expired or forfeited |  |  | (88,000 | ) |  |  | 5.55 |
Granted |  |  | 23,000 |  |  |  | 3.65 |
Options outstanding and exercisable at December 31, 2015 |  |  | 448,184 |  |  |  | 5.40 |
Expired or forfeited |  |  | (232,200 | ) |  |  | 6.50 |
Granted |  |  | 18,000 |  |  |  | 11.50 |
Exercised |  |  | (141,704 | ) |  |  | 4.15 |
Options outstanding and exercisable at December 31, 2016 |  |  | 92,280 |  |  |  | 5.85 |
Granted |  |  | 5,000 |  |  |  | 8.10 |
Exercised |  |  | (69,280 | ) |  |  | 4.50 |
Options outstanding and exercisable at December 31, 2017 |  |  | 28,000 |  |  |  | 9.55 |
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] |
|  | 2017 |  | 2016 |  | 2015 |  | 2015
Options granted |  | *5,000 |  | *18,000 |  | 90,000 |  | 25,000
Grant date |  | May 30, 2017 |  | October 13, 2016 |  | December 21, 2015 |  | October 7, 2015
Risk-free interest rate |  | 2.40% |  | 0.53% |  | 0.53% |  | 0.53%
Expected stock price volatility (based on historical volatility) |  | 118% |  | 119% |  | 41,2% |  | 39,6%
Expected option life in years |  | 3 |  | 5 |  | 5 |  | 5
Exercise price |  | * CAD 8.10 |  | * CAD 11.50 |  | CAD 0.74 |  | CAD 0.80
Share price at grant date |  | * CAD8.10 |  | * CAD 11.50 |  | CAD 0.74 |  | CAD 0.79
Fair value at grant date |  | * USD 5.81 |  | * USD 9.45 |  | USD 0.27 |  | USD 0.27
|  |  | *2017 |  |  |  | *2016 |
|  |  | RSUs |  |  |  | PSUs |  |  |  | RSUs |  |  |  | PSUs |
Fair value (USD) |  | $ | 7.37 |  |  | $ | 7.17 |  |  | $ | 5.50 |  |  | $ | 5.25 |
Share price (USD) |  | $ | 7.37 |  |  | $ | 7.37 |  |  | $ | 5.50 |  |  | $ | 5.50 |
Performance multiplier percentage |  |  | - |  |  |  | 94 | % |  |  | - |  |  |  | 100 | %
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block] |
|  | RSUs |  |  | PSUs |  |  | RSUs |  |  | PSUs |
Grant - January 11, 2016 |  |  | 60,645 |  |  |  | 242,579 |  |  |  | 60,645 |  |  |  | 242,579 |
Grant - March 23, 2016 |  |  | 10,965 |  |  |  | 43,871 |  |  |  | 10,967 |  |  |  | 43,871 |
Grant - June 8, 2016 |  |  | 5,117 |  |  |  | 20,470 |  |  |  | 5,117 |  |  |  | 20,470 |
Grant - January 19, 2017 |  |  | 4,443 |  |  |  | 17,774 |  |  |  | - |  |  |  | - |
RSU dividend reinvestments |  |  | 7,324 |  |  |  | - |  |  |  | 3,505 |  |  |  | - |
Total awards at December 31 |  |  | 88,494 |  |  |  | 324,694 |  |  |  | 80,234 |  |  |  | 306,920 |
Faciliation and advanced dividend loans [member] |
Statement Line Items [Line Items] |
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block] |
Modification date |  | June 23, 2017
Blanket Mine dividend yield |  | 23.70% | - | 89.88%
Risk free interest rate |  | USD swap curve
Group market capitalisation at grant date ($’000) |  | USD 68,436

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