Note 7 - Hedging Program and Derivatives - Impact of Derivative Contracts on Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative liabilities	$ 21,477	$ 10,837
Derivative liabilities long-term	10,852	2,387
Total Assets
Total Liabilities	32,329	13,224
Commodity Contract [Member] \| Derivative Assets Current [Member]
Derivative asset, current
Commodity Contract [Member] \| Derivative Liabilities Current [Member]
Derivative liabilities	21,477	10,837
Commodity Contract [Member] \| Derivative Assets Noncurrent [Member]
Derivative asset, long-term
Commodity Contract [Member] \| Derivative Liabilities Noncurrent [Member]
Derivative liabilities long-term	$ 10,852	$ 2,387

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