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Note 16 - Tax Expense (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]        
Applicable tax rate   0.00% 0.00% 0.00%
Total average effective tax rate   35.36% 39.10%  
Net deferred tax assets   $ 202 $ 194  
Net deferred tax liabilities   5,123 8,034  
South African operations [member]        
Statement Line Items [Line Items]        
Net deferred tax assets   202 194  
Zimbabwean operations [member]        
Statement Line Items [Line Items]        
Net deferred tax liabilities   $ 5,123 $ 8,034  
Zimbabwean operations [member]        
Statement Line Items [Line Items]        
Tax rate effect of foreign tax rates   24.72% 24.72% 25.75%
South African operations [member]        
Statement Line Items [Line Items]        
Tax rate effect of foreign tax rates   28.00% 28.00% 28.00%
South African operations [member] | Changes in tax rates or tax laws enacted or announced [member]        
Statement Line Items [Line Items]        
Tax rate effect of foreign tax rates 27.00%