Note 10 - Revenues (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

	Year ended December 31,
(In thousands)	2019		2018		2017
Coal Sales
Domestic revenues	$	164,256	$	121,433	$	31,199
Export revenues		65,957		106,141		27,599
Coal Processing		—		—		2,238
Total revenues	$	230,213	$	227,574	$	61,036