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Note 14 - Derivative Financial Instruments (Details Textual)
 1 Months Ended 12 Months Ended
Dec. 13, 2021
USD ($)
oz
May 05, 2021
USD ($)
Nov. 30, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Auramet International LLC [Member]            
Statement Line Items [Line Items]            
Number of Agreements 2          
Proceeds from derivative financial liabilities $ 3,000,000          
Auramet International LLC [Member] | Gold loan agreement [member]            
Statement Line Items [Line Items]            
Proceeds from derivative financial liabilities $ 3,000,000          
Number of Deliveries 2          
Repayment gold loan, delivery mass of each (Ounce) | oz 925          
Financial liabilities, at fair value       $ 1,833,000    
Auramet International LLC [Member] | Call option [member]            
Statement Line Items [Line Items]            
Call options, mass (Ounce) | oz 6,000          
Strike price per ounce $ 2,000          
Commodity price risk [member] | Derivative contract for 4,600 ounces of Gold [member]            
Statement Line Items [Line Items]            
Hedging instruments, participation, price     $ 379,000      
Derivative contract, number of ounces of gold hedged     4,600      
Hedging instruments, protected, price     $ 1,400      
Hedged item, assets         $ 102,000  
Gold ETF [member]            
Statement Line Items [Line Items]            
Derivative instrument, notional amount           $ 1,058,000
Trading income (expense) on foreign exchange contracts       (105,000) (164,000)  
Gains (losses) on change in value of foreign currency basis spreads, net of tax       $ 14,000 $ 100,000  
Proceeds from sales or maturity of financial instruments, classified as investing activities   $ 1,066,000