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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