Note 6 - Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Estimated
	Useful Lives		As of December 31,
	(Years)		2018			2019
			(dollars in thousands)
Land		N/A	$	24,705		$	24,705
Land improvements		10-20		5,758			5,831
Pipelines and facilities		5-30		116,155			105,985
Storage and terminal facilities		10-35		321,096			328,092
Transportation equipment		3-10		2,798			3,613
Office property and equipment and other		3-20		26,980			27,292
Pipeline linefill and tank bottoms		N/A		10,297			8,148
Construction-in-progress		N/A		4,026			3,515
Property, plant and equipment, gross				511,815			507,181
Accumulated depreciation				(263,554	)		(274,404	)
Property, plant and equipment, net			$	248,261		$	232,777