Note 11 - Revenue - Domestic Revenues an Export Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
REVENUES
Revenues	$ 283,394	$ 168,915	$ 230,213
Domestic Coal Revenues
REVENUES
Revenues	143,946	119,981	170,927
Export Revenues
REVENUES
Revenues	$ 139,448	$ 48,934	$ 59,286