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Consolidated Balance Sheets (Parentheticals) - $ / shares
Jun. 30, 2015
May. 13, 2015
May. 12, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2012
Series A Convertible Preferred Stock [Member]            
Preferred stock, par value (in dollars per share)       $ 1,000 $ 1,000 $ 1,000
Preferred stock, shares authorized (in shares)           2,200
Preferred stock, shares issued (in shares)       0 71  
Preferred stock, shares outstanding (in shares)       0 71  
Series B Convertible Preferred Stock [Member]            
Preferred stock, par value (in dollars per share) $ 1,000     $ 1,000 $ 1,000  
Preferred stock, shares issued (in shares) 100     100 1,650  
Preferred stock, shares outstanding (in shares) 100     100 1,650  
Preferred stock, par value (in dollars per share) $ 0.01     $ 0.01 $ 0.01  
Preferred stock, shares authorized (in shares) 10,000,000     10,000,000 10,000,000  
Common stock, par value (in dollars per share) $ 0.001     $ 0.001 $ 0.001  
Common stock, shares authorized (in shares) 150,000,000 150,000,000 75,000,000 75,000,000 75,000,000  
Common stock, shares issued (in shares) 31,950,813     31,950,813 23,765,180  
Common stock, shares outstanding (in shares) 31,950,813     31,950,813 23,765,180