Note 6 - Hedging Program and Derivatives - Derivative Contracts (Details)	3 Months Ended
	Mar. 31, 2020 $ / bbl
Fixed Swap 2020 [Member]
Daily volume	3,729
Swap price (in USD per Barrel of Oil)	55.1
Fixed Swap 2021 [Member]
Daily volume	2,889
Swap price (in USD per Barrel of Oil)	57.62
Fixed Swap 2022 [Member]
Daily volume	2,412
Swap price (in USD per Barrel of Oil)	50.6
Fixed Swap 2023 [Member]
Daily volume	1,498
Swap price (in USD per Barrel of Oil)	50.6
Fixed Swap 2024 [Member]
Daily volume	1,589
Swap price (in USD per Barrel of Oil)	50.6
Basis Swaps 2020 [Member]
Daily volume	4,000
Swap price (in USD per Barrel of Oil)	2.98