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Note 10 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Metal Swaps $ 4,869  
Derivative asset   $ 1,748
Derivative asset   1,748
Metal Swaps 3,727  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Metal Swaps 0  
Derivative asset   0
Derivative asset   0
Metal Swaps 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Metal Swaps 4,869  
Derivative asset   1,748
Derivative asset   1,748
Metal Swaps 3,727  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Metal Swaps 0  
Derivative asset   0
Derivative asset   0
Metal Swaps 0  
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Derivative asset   1,748
Derivative asset   1,748
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Metal Swaps 1,142  
Derivative asset   0
Derivative asset   0
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Metal Swaps 1,142  
Derivative asset   1,748
Derivative asset   1,748
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative asset   0
Derivative asset   $ 0
Fair Value, Recurring [Member] | Metal Swaps [Member]    
Metal Swaps 3,317  
Metal Swaps 3,727  
Fair Value, Recurring [Member] | Metal Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Metal Swaps 0  
Metal Swaps 0  
Fair Value, Recurring [Member] | Metal Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Metal Swaps 3,317  
Metal Swaps 3,727  
Fair Value, Recurring [Member] | Metal Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Metal Swaps 0  
Metal Swaps 0  
Fair Value, Recurring [Member] | Embedded Customer Derivatives [Member]    
Metal Swaps 410  
Fair Value, Recurring [Member] | Embedded Customer Derivatives [Member] | Fair Value, Inputs, Level 1 [Member]    
Metal Swaps 0  
Fair Value, Recurring [Member] | Embedded Customer Derivatives [Member] | Fair Value, Inputs, Level 2 [Member]    
Metal Swaps 410  
Fair Value, Recurring [Member] | Embedded Customer Derivatives [Member] | Fair Value, Inputs, Level 3 [Member]    
Metal Swaps $ 0