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Note 1 - Business and Basis of Presentation (Details) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 7 Months Ended
Jul. 31, 2012
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 30, 2011
Apr. 30, 2011
Net Of Issuance Costs [Member]
May 31, 2012
Purchase Option [Member]
Jul. 31, 2011
Private Placement [Member]
Note 1 - Business and Basis of Presentation (Details) [Line Items]                  
Retained Earnings (Accumulated Deficit)     $ (211,954,000) $ (183,587,000)          
Convertible Debt Issuable In Connection With Private Placement1           4,500,000      
Proceeds from Convertible Debt   3,000,000         1,300,000 3,000,000  
Proceeds From Sale Of Units Of Common Stock And Warrants Net (in Dollars)                 22,800,000
Proceeds from Issuance of Private Placement (in Dollars) 50,500,000                
Cash and Cash Equivalents, at Carrying Value   $ 12,442,000 $ 34,849,000 $ 53,506,000 $ 17,974,000