Note 5 - Receivables, Accounts Payable and Accrued Liabilities (Details) - Summary of Accounts Receivable (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 1,922	$ 21,630
Accounts receivable - joint venture		12,230
Commodity Sales [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,473	2,303
Accounts Receivable - Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 449	$ 7,097