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Note 8 - Leases (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
lease
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Lessee, Lease, Description [Line Items]      
Amortization of right of use assets with finance lease $ 4,800 $ 1,100 $ 0
Interest expense recognized for financing lease liabilities $ 400 100 0
Number of operating leases | lease 1    
Operating lease expenses $ 200 100 $ 100
Financing lease right-of-use assets, net 12,905 9,128  
Operating Lease, Right-of-Use Asset $ 694 $ 25  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Total right-of-use assets $ 13,599 $ 9,153  
Finance Lease, Liability, Current 5,969 3,461  
Operating Lease, Liability, Current $ 122 $ 25  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued expenses Accrued expenses  
Finance Lease, Liability, Noncurrent $ 4,917 $ 4,599  
Operating Lease, Liability, Noncurrent $ 585    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent    
Present value of lease obligations $ 11,593 $ 8,085  
Office Space      
Lessee, Lease, Description [Line Items]      
Term of financing leases 5 years    
Maximum | Mining equipment      
Lessee, Lease, Description [Line Items]      
Term of financing leases 36 months