Note 13 - Hedging Program and Derivatives (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Derivative Instruments [Table Text Block]

	Oil - WTI
Contract Periods	Daily Volume (Bbl)		Swap Price (per Bbl)
Fixed Swaps
January - December 2019		2,941	$	56.20
January - December 2020		2,204	$	54.35
January - December 2021		1,815	$	60.32
Basis Swaps
January - December 2019		4,000	$	2.98
January - December 2020		4,000	$	2.98

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Fair Value Derivative Contracts as of December 31, 2017
	Asset Derivatives			Liability Derivatives
Derivatives not designated as hedging instruments	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Commodity price derivatives	Derivatives - current	$	-	Derivatives - current	$	10,837
Commodity price derivatives	Derivatives - long-term		-	Derivatives - long-term		2,387
		$	-		$	13,224
Fair Value Derivative Contracts as of December 31, 2018
	Asset Derivatives			Liability Derivatives
Derivatives not designated as hedging instruments	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Commodity price derivatives	Derivatives - current	$	9,602	Derivatives - current	$	616
Commodity price derivatives	Derivatives - long-term		10,527	Derivatives - long-term		4,434
		$	20,129		$	5,050