Note 8 - Revenue (Tables)

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Three months ended June 30,				Six months ended June 30,
(In thousands)	2024		2023		2024		2023
Coal Sales
North American revenue	$	55,342	$	53,401	$	109,515	$	93,428
Export revenue, excluding Canada		99,973		84,068		218,476		210,401
Total revenue	$	155,315	$	137,469	$	327,991	$	303,829