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Note 33 - Financial Instruments and Risk Management - Credit Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Trade and other receivables [member]    
Statement Line Items [Line Items]    
Carrying amount $ 4,776 $ 2,684
Cash and cash equivalents [member]    
Statement Line Items [Line Items]    
Carrying amount 17,152 19,092
Zimbabwean operations [member] | Trade and other receivables [member]    
Statement Line Items [Line Items]    
Carrying amount 4,753 1,581
Zimbabwean operations [member] | Cash and cash equivalents [member]    
Statement Line Items [Line Items]    
Carrying amount 3,470 5,116
Jersey, Channel Islands [member] | Trade and other receivables [member]    
Statement Line Items [Line Items]    
Carrying amount 0 1,100
Jersey, Channel Islands [member] | Cash and cash equivalents [member]    
Statement Line Items [Line Items]    
Carrying amount 13,045 11,244
Other [member] | Trade and other receivables [member]    
Statement Line Items [Line Items]    
Carrying amount 23 3
Other [member] | Cash and cash equivalents [member]    
Statement Line Items [Line Items]    
Carrying amount $ 637 $ 2,732