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Note 1 - Business (Details Textual) (USD $)
51 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Retained Earnings (Accumulated Deficit) $ (335,807,000)us-gaap_RetainedEarningsAccumulatedDeficit $ (315,237,000)us-gaap_RetainedEarningsAccumulatedDeficit    
Proceeds from Issuance of Long-term Debt and Capital Securities, Net 194,300,000us-gaap_ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet      
Cash and Cash Equivalents, at Carrying Value $ 55,556,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 72,675,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 57,475,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 72,287,000us-gaap_CashAndCashEquivalentsAtCarryingValue