Note 1 - Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended	12 Months Ended
	Apr. 27, 2012	Jun. 30, 2013	Dec. 31, 2012
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Ownership Percentage		10.00%
Proceeds From Sale Of Participating Interest (in Dollars)	$ 150.0
Ownership Percentage Sold	49.00%		49.00%
Capital And Exploratory Expenditures Funding Agreement (in Dollars)	$ 185.0	$ 112.0	$ 126.3
SMC Ecuador [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Ownership Percentage		10.00%
Exploration Phase For Oil Exploration And Production [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
TermOfExplorationPhaseSuccessful		30 years
Exploration Phase For Gas Exploration And Production [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
TermOfExplorationPhaseSuccessful		40 years
Gross [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Area of Land (in Acres)		2,200,000
Net [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Area of Land (in Acres)		1,900,000
Block Z-1 [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Area of Land (in Acres)		600,000
Ownership Percentage		51.00%
Block XIX [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Area of Land (in Acres)		500,000
Ownership Percentage		100.00%
Block XXII [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Area of Land (in Acres)		900,000
Ownership Percentage		100.00%
Block XXIII [Member]
Note 1 - Basis of Presentation and Significant Accounting Policies (Details) [Line Items]
Area of Land (in Acres)		200,000
Ownership Percentage		100.00%