Note 7 - Revenues (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Three months ended March 31,
(In thousands)	2020		2019
Coal Sales
Domestic revenues	$	30,532	$	36,571
Export revenues		11,403		20,889
Total revenues	$	41,935	$	57,460