Note 16 - Other Operating Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 16 - Other Operating Expense (Details) [Line Items]
Other Cost and Expense, Operating	$ 2,683	$ 1,510	$ 2,683	$ 2,266
Pre-Development Drilling Studies and Associated Capitalized Interest [Member]
Note 16 - Other Operating Expense (Details) [Line Items]
Other Cost and Expense, Operating	2,700		2,700
Piedra Redonda Platform [Member] | Abandonment Charges [Member]
Note 16 - Other Operating Expense (Details) [Line Items]
Other Cost and Expense, Operating		$ 1,500		$ 2,300