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Note 18 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement Line Items [Line Items] |  |  |
Additions other than through business combinations, property, plant and equipment | $ 31,269 | $ 24,778 |
Borrowing costs capitalised | 17 | 53 |
Total property, plant and equipment | 149,102 | 126,479 |
Prepayments of property, plant and equipment | 2,951 | 0 |
Impairment loss recognised in profit or loss, property, plant and equipment | 498 | 0 | $ 144
Entities in Zimbabwe [member] |  |  |
Statement Line Items [Line Items] |  |  |
Prepayments of property, plant and equipment | 426 |  |
Construction in progress [member] |  |  |
Statement Line Items [Line Items] |  |  |
Additions other than through business combinations, property, plant and equipment | 19,413 | 6,476 |
Total property, plant and equipment | 42,145 | $ 85,479 |
EPC agreement [member] | Voltalia [member] |  |  |
Statement Line Items [Line Items] |  |  |
Prepayments of property, plant and equipment | 1,821 |  |
Equipment [member] | Voltalia [member] |  |  |
Statement Line Items [Line Items] |  |  |
Prepayments of property, plant and equipment | 704 |  |
Gensets [member] |  |  |
Statement Line Items [Line Items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 1,001 |  |
Guide ropes [member] |  |  |
Statement Line Items [Line Items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 310 |  |
Central Shaft [member] |  |  |
Statement Line Items [Line Items] |  |  |
Increase (decrease) through transfers, property, plant and equipment | $ 18,509 |  |

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