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Note 11 - Derivative Instruments (Details Textual) - USD ($)
$ in Thousands
Jan. 10, 2019
Dec. 31, 2021
Dec. 31, 2020
Metal Swaps [Member]      
Derivative, Notional Amount     $ 0
Interest Rate Swap [Member]      
Derivative, Notional Amount $ 75,000    
Derivative, Term of Contract (Year) 5 years    
Derivative, Fixed Interest Rate 2.57%    
Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member]      
Derivative Liability, Total   $ 2,700 $ 5,600