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Consolidated Balance Sheets (Parentheticals)
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Preferred stock, shares authorized (in shares) 5,000,000  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001  
Common stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 6,093,843 5,508,261
Common stock, shares outstanding (in shares) 6,093,843 5,508,261
Reverse Stock Split [Member]    
Common stock, reverse stock split, shares 12 2
Convertible Preferred Stock [Member] | Series A-1 Shares [Member]    
Preferred stock, shares authorized (in shares) 100,000 100,000
Preferred stock, liquidation value | $ $ 100 $ 100
Preferred stock, shares issued (in shares) 90,000 90,000
Preferred stock, shares outstanding (in shares) 90,000 90,000
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001
Convertible Preferred Stock [Member] | Series B-1 Shares [Member]    
Preferred stock, shares authorized (in shares) 105,000 105,000
Preferred stock, liquidation value | $ $ 100 $ 100
Preferred stock, shares issued (in shares) 105,000 105,000
Preferred stock, shares outstanding (in shares) 105,000 105,000
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001