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Note 8 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Gain (Loss) Recognized $ (475) $ (459) $ (1,406) $ (1,055)
Interest Rate Swap [Member]        
Net Gain (Loss) Recognized (475) (459) (1,406) (1,055)
Metal Swaps [Member]        
Net Gain (Loss) Recognized (92) 82 136 55
Embedded Customer Derivatives [Member]        
Net Gain (Loss) Recognized $ 92 $ (82) $ (136) $ (55)