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Note 9 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Total liabilities recorded at fair value $ 6,043 $ 3,046
Embedded customer derivatives   4
Total assets at fair value   4
Interest Rate Swap [Member]    
Derivative liability 6,043 3,042
Metal Swaps [Member]    
Derivative liability   4
Fair Value, Inputs, Level 1 [Member]    
Total liabilities recorded at fair value 0 0
Embedded customer derivatives   0
Total assets at fair value   0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Derivative liability 0 0
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member]    
Derivative liability   0
Fair Value, Inputs, Level 2 [Member]    
Total liabilities recorded at fair value 6,043 3,046
Embedded customer derivatives   4
Total assets at fair value   4
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative liability 6,043 3,042
Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member]    
Derivative liability   4
Fair Value, Inputs, Level 3 [Member]    
Total liabilities recorded at fair value 0 0
Embedded customer derivatives   0
Total assets at fair value   0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Derivative liability $ 0 0
Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member]    
Derivative liability   $ 0