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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / 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) 6,096,920 6,093,843
Common stock, shares outstanding (in shares) 6,096,920 6,093,843
Reverse Stock Split [Member]    
Common stock, reverse stock split, shares 12 12
Series A-1 Convertible Preferred Stock [Member]    
Preferred stock, shares authorized (in shares) 100,000 100,000
Preferred stock, liquidation value (in dollars per share) | $ / shares $ 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
Series B-1 Convertible Preferred Stock [Member]    
Preferred stock, shares authorized (in shares) 105,000 105,000
Preferred stock, liquidation value (in dollars per share) | $ / shares $ 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