Note 4 - Fair Value Measurements - Assets and Liabilities Measured On Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Commodity price derivatives – current	$ 24,843	$ 31,480
Commodity price derivatives – noncurrent	0	16,059
Commodity price derivatives – current	1,937	13,054
Commodity price derivatives – noncurrent	0	65
Commodity Contract [Member]
Total recurring fair value measurements, net	(22,906)
Commodity Contract [Member] | Fair Value, Recurring [Member]
Commodity price derivatives – current	24,843	31,480
Commodity price derivatives – noncurrent		16,059
Commodity price derivatives – current	1,937	13,054
Total assets		47,539
Total recurring fair value measurements, net	22,906	34,420
Commodity price derivatives – noncurrent		65
Total liabilities		13,119
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Commodity price derivatives – current	0	0
Commodity price derivatives – noncurrent		0
Commodity price derivatives – current	0	0
Total assets		0
Total recurring fair value measurements, net	0	0
Commodity price derivatives – noncurrent		0
Total liabilities		0
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Commodity price derivatives – current	24,843	31,480
Commodity price derivatives – noncurrent		16,059
Commodity price derivatives – current	1,937	13,054
Total assets		47,539
Total recurring fair value measurements, net	22,906	34,420
Commodity price derivatives – noncurrent		65
Total liabilities		13,119
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Commodity price derivatives – current	0	0
Commodity price derivatives – noncurrent		0
Commodity price derivatives – current	0	0
Total assets		0
Total recurring fair value measurements, net	$ 0	0
Commodity price derivatives – noncurrent		0
Total liabilities		$ 0