Note 7 - Derivative Instruments - Schedule of Derivative Instruments (Details) - Energy Related Derivative [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Total derivatives not designated or not qualifying as hedging instruments - Assets		$ 498		$ 498		$ 868
Total derivatives not designated or not qualifying as hedging instruments - Liabilities		1,381		1,381		473
Cost of Sales [Member]
Energy contracts and options		3,992	$ 8,404	818	$ 13,936
Other Current Assets [Member]
Total derivatives not designated or not qualifying as hedging instruments - Assets	[1]	146		146		583
Other Current Liabilities [Member]
Total derivatives not designated or not qualifying as hedging instruments - Liabilities	[1]	1,325		1,325		428
Other Noncurrent Assets [Member]
Total derivatives not designated or not qualifying as hedging instruments - Assets		352		352		285
Other Noncurrent Liabilities [Member]
Total derivatives not designated or not qualifying as hedging instruments - Liabilities		$ 56		$ 56		$ 45

[1] The Company classifies derivative assets and liabilities as current based on the cash flows expected to be incurred within the following 12 months.