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Note 13 - Quarterly Financial Information (Unaudited) (Detail) - Quarterly Financial Information (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues $ 362 $ 1,019 $ 1,023
Operating loss (13,068) (11,234) (11,049)
Net loss applicable to common stock (19,574) (16,837) (15,899)
Basic and diluted net loss per common share (in Dollars per share) $ (1.27) $ (1.20) $ (1.16)
Quarter Ended March 31 [Member]
      
Revenues 31 457  
Gross profit 31 25  
Operating loss (2,885) (3,029)  
Net loss applicable to common stock (4,448) (4,254)  
Basic and diluted net loss per common share (in Dollars per share) $ (0.29) $ (0.31)  
Quarter Ended June 30 [Member]
      
Revenues 6 40  
Gross profit 4 22  
Operating loss (2,986) (2,288)  
Net loss applicable to common stock (4,584) (3,728)  
Basic and diluted net loss per common share (in Dollars per share) $ (0.30) $ (0.27)  
Quarter Ended September 30 [Member]
      
Revenues 287 121  
Gross profit (6) (145)  
Operating loss (3,068) (2,704)  
Net loss applicable to common stock (4,736) (4,105)  
Basic and diluted net loss per common share (in Dollars per share) $ (0.31) $ (0.29)  
Quarter Ended December 31 [Member]
      
Revenues 38 401  
Gross profit (188) (324)  
Operating loss (4,129) (3,213)  
Net loss applicable to common stock $ (5,806) $ (4,750)  
Basic and diluted net loss per common share (in Dollars per share) $ (0.38) $ (0.33)