Note 6 - Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Estimated
	Useful Lives		As of December 31,
	(Years)		2020			2021
			(dollars in thousands)
Land		N/A	$	21,826		$	21,826
Land improvements		10-20		5,024			5,125
Storage and terminal facilities		10-35		249,977			257,433
Office property and equipment and other		3-30		23,278			21,751
Construction-in-progress		N/A		2,165			4,355
Property, plant and equipment, gross				302,270			310,490
Accumulated depreciation				(197,561	)		(204,101	)
Property, plant and equipment, net			$	104,709		$	106,389