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Note 2 - Summary of Significant Accounting Policies - Amortization and Impairment (Details)
12 Months Ended
Dec. 31, 2021
Statement Line Items [Line Items]  
Right-of-use asset straight-line over the earlier of the end of the lease term or useful life of the asset
Buildings [member]  
Statement Line Items [Line Items]  
Amortization Percentage 4.00%
Office and computer equipment [member]  
Statement Line Items [Line Items]  
Amortization Percentage 30.00%
Mining assets [member]  
Statement Line Items [Line Items]  
Amortization Percentage 30.00%