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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 2,798,475 84,005
Common stock, shares outstanding (in shares) 2,798,475 84,005
Series C Convertible Preferred Stock [Member]    
Preferred stock, shares authorized (in shares) 11,000
Preferred stock, shares outstanding (in shares) 441
Preferred stock, shares issued (in shares) 441
Series A Convertible Preferred Stock [Member]    
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares outstanding (in shares) 262,310 262,364
Preferred stock, shares issued (in shares) 264,000 264,000
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, liquidation preference $ 2,623 $ 2,623