Note 3 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Derivative Assets at Fair Value [Table Text Block]

	September 30, 2020		December 31, 2019
Assets:
Derivatives instruments - open contracts, current	$	7,809	$	6,921
Derivatives instruments - open contracts, long-term		1,511		2,653
Liabilities:
Derivatives instruments - open contracts, current		7,734		1,785
Derivatives instruments - open contracts, long-term		6,222		—

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

	September 30, 2020				December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
Liabilities:
Credit Agreement	$	80,000	$	80,000	$	105,000	$	105,000
Senior Second Lien Notes		544,747		379,623		614,533		597,188