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Note 1 - Principles of Consolidation and Basis of Presentation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 89 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 27, 2012
IBio Inc [Member] | Minimum [Member]            
Share Price   $ 0.88 $ 0.88 $ 0.88 $ 0.88  
IBio Inc [Member] | Minimum Share Price Acceptable Before Required to Sell [Member]            
Share Price   $ 0.88 $ 0.88      
IBio Inc [Member]            
Equity Method Investment, Ownership Percentage   6.00% 6.00%      
Investment Owned, Balance, Shares   1,266,706 1,266,706      
Asset Impairment Charges     $ 2,200      
Investment Owned, at Fair Value   $ 700 $ 700      
Consecutive Trading Days for Stock Price Threshold   15 days        
Investment, Shares Sold 73,191          
Proceeds from Sale of Long-term Investments $ 79          
Share Price $ 0.09 $ 0.10 $ 0.10     $ 0.09