Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from Contract with Customer	$ 58,281	$ 74,181
Revenue from non-contractual arrangements	55	55
Revenue	58,281	74,181
Bill and Hold Revenue [Member]
Revenue from Contract with Customer	11,644	10,590
Revenue	11,644	10,590
Non-bill and Hold Revenue [Member]
Revenue from Contract with Customer	46,637	63,591
Revenue	46,637	63,591
Short-Term Contract with Customer [Member]
Revenue from Contract with Customer	9,240	10,465
Revenue	9,240	10,465
Long-Term Contract with Customer [Member]
Revenue from Contract with Customer	48,986	63,661
Revenue	$ 48,986	$ 63,661