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Note 5 - Tribute Arrangement and Mining Agreement and Bilboes Gold Limited Acquisition (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 12 Months Ended
Jan. 06, 2023
Jul. 21, 2022
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Apr. 11, 2023
Mar. 30, 2023
Statement Line Items [Line Items]                
Administrative expenses       $ 17,429 $ 11,941 $ 9,091    
Assets of Bilboes Gold Limited [member]                
Statement Line Items [Line Items]                
Acquisition, number of shares issuable (in shares)   5,123,044            
Percentage of net smelter royalty   1.00%            
Acquisition, number of shares issued (in shares) 4,425,797              
Acquisition, escrow shares issuable (in shares) 441,095             441,095
Acquisition, deferred consideration shares issuable (in shares) 256,152           256,152  
Acquistion, consideration shares issued (in shares)             5,123,044  
Acquisition, consideration issued and issuable $ 65,677           $ 65,677  
Acquisition, consideration shares, closing share price (in dollars per share)             $ 12.82  
Administrative expenses       $ 3,100        
Caledonia Holdings Zimbabwe (Private) Limited [member] | Bilboes Holdings (Private) Limited [member]                
Statement Line Items [Line Items]                
Tribute agreement, rate of return   25.00%            
Caledonia Holdings Zimbabwe (Private) Limited [member] | Bilboes Holdings (Private) Limited [member] | Oxide plant [member]                
Statement Line Items [Line Items]                
Property, plant and equipment, expenditures recognised in course of its construction   $ 872            
Impairment of property, plant and equipment     $ 851