Note 7 - Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2020
Assets:
NYMEX fixed price derivative contracts	$	—	$	69,533	$	—	$	69,533
NYMEX basis differential swap contracts		—		—		1,275		1,275
Total Assets	$	—	$	69,533	$	1,275	$	70,808
Liabilities:
NYMEX fixed price derivative contracts	$	—	$	—	$	—	$	-
NYMEX basis differential swaps		—		—		800		800
Total Liabilities	$	—	$	-	$	800	$	800

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2019
Assets:
NYMEX fixed price derivative contracts	$	—	$	4,253	$	—	$	4,253
Total Assets	$	—	$	4,253	$	—	$	4,253
Liabilities:
NYMEX fixed price derivative contracts	$	—	$	5,583	$	—	$	5,583
NYMEX basis differential swaps		—		—		6,104		6,104
Total Liabilities	$	—	$	5,583	$	6,104	$	11,687

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Unobservable inputs at January 1, 2020	$	(6,104	)
Changes in market value		5,178
Settlements during the period		1,401
Unobservable inputs at March 31, 2020	$	475