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Note 8 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Gain (Loss) Recognized $ (463) $ (202)
Interest Rate Swap [Member]    
Net Gain (Loss) Recognized (463) (202)
Metal Swaps [Member]    
Net Gain (Loss) Recognized (17) (112)
Embedded Customer Derivatives [Member]    
Net Gain (Loss) Recognized $ 17 $ 112