Note 4 - Fair Value Measurements - Assets and Liabilities Measured On Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Commodity price derivatives – current	$ 2,278	$ 31,480
Commodity price derivatives – noncurrent	227	16,059
Commodity price derivatives – current	12,599	13,054
Commodity price derivatives – noncurrent	775	65
Commodity Contract [Member]
Total recurring fair value measurements, net	10,869
Commodity Contract [Member] | Fair Value, Recurring [Member]
Commodity price derivatives – current	2,278	31,480
Commodity price derivatives – noncurrent	227	16,059
Total assets	2,505	47,539
Commodity price derivatives – current	12,599	13,054
Commodity price derivatives – noncurrent	775	65
Total liabilities	13,374	13,119
Total recurring fair value measurements, net	(10,869)	34,420
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Commodity price derivatives – current	0	0
Commodity price derivatives – noncurrent	0	0
Total assets	0	0
Commodity price derivatives – current	0	0
Commodity price derivatives – noncurrent	0	0
Total liabilities	0	0
Total recurring fair value measurements, net	0	0
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Commodity price derivatives – current	2,278	31,480
Commodity price derivatives – noncurrent	227	16,059
Total assets	2,505	47,539
Commodity price derivatives – current	12,599	13,054
Commodity price derivatives – noncurrent	775	65
Total liabilities	13,374	13,119
Total recurring fair value measurements, net	(10,869)	34,420
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Commodity price derivatives – current	0	0
Commodity price derivatives – noncurrent	0	0
Total assets	0	0
Commodity price derivatives – current	0	0
Commodity price derivatives – noncurrent	0	0
Total liabilities	0	0
Total recurring fair value measurements, net	$ 0	$ 0