Note 13 - Hedging Program and Derivatives - Impact of Derivative Contracts on Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative asset, current	$ 9,602
Derivative liability, current	616	10,837
Derivative asset, long-term	10,527
Derivative liability, long-term	4,434	2,387
Derivative Asset, Total	20,129
Derivative liability	5,050	13,224
Commodity Contract [Member]
Derivative Asset, Total	15,100
Commodity Contract [Member] \| Derivative Assets Current [Member]
Derivative asset, current	9,602
Commodity Contract [Member] \| Derivative Liabilities Current [Member]
Derivative liability, current	616	10,837
Commodity Contract [Member] \| Derivative Assets Noncurrent [Member]
Derivative asset, long-term	10,527
Commodity Contract [Member] \| Derivative Liabilities Noncurrent [Member]
Derivative liability, long-term	$ 4,434	$ 2,387

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