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Note 8 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Gain (Loss) Recognized $ (394) $ (22) $ (596) $ (31)
Interest Rate Swap [Member]        
Net Gain (Loss) Recognized (394) (22) (596) (31)
Metal Swaps [Member]        
Net Gain (Loss) Recognized 85 3 (27) 133
Embedded Customer Derivatives [Member]        
Net Gain (Loss) Recognized $ (85) $ (3) $ 27 $ (133)