Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Share Capital (Details Textual)

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Note 9 - Share Capital (Details Textual) - USD ($)
 3 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Jun. 03, 2019
May 13, 2019
Jun. 08, 2018
Sep. 30, 2019
Sep. 30, 2018
May 24, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2018
May 24, 2019
Dec. 31, 2017
May 07, 2019
May 30, 2018
Mar. 27, 2018
Oct. 27, 2017
Public Offering [Member]                                
Stock Issued During Period, Shares, New Issues 11,500,000                              
Shares Issued, Price Per Share $ 1.85                              
Proceeds from Issuance of Common Stock, Gross $ 21,275,000                              
Proceeds from Issuance of Common Stock 19,736,000         $ 19,736,000              
Stock Issued During Period, Value, New Issues $ 19,594,000             19,594,000                
Stock Issuance, Percent of Cash Commission to Broker 7.00%                              
The 2019 Share Purchase Agreement [Member]                                
Stock Issued During Period, Shares, New Issues   171,428                            
Stock Issued During Period, Value, New Issues   $ 360,000           360,000                
Stock Issuance Program, Authorized Amount                         $ 20,000,000      
Stock Purchase Agreement, Minimum Average Stock Price to Issue More Shares                         $ 2.10      
The 2019 Share Purchase Agreement [Member] | Aspire [Member]                                
Stock Purchase Agreement, Maximum Percent of Issued and Outstanding Common Shares Ownable                         9.99%      
Stock Purchase Agreement, Maximum Percent of Shares Issued                         19.99%      
The 2018 Purchase Agreement [Member]                                
Stock Issued During Period, Shares, New Issues     170,261     5,502,433         6,409,980          
Shares Issued, Price Per Share           $ 1.82         $ 1.82          
Proceeds from Issuance of Common Stock           $ 10,000,000         $ 11,900,000          
Stock Issued During Period, Value, New Issues     $ 600,000         10,000,000 600,000              
Stock Issuance Program, Authorized Amount                           $ 20,000,000    
Proceeds from Issuance of Common Stock, Net           10,000,000   11,900,000          
The 2017 Purchase Agreement [Member]                                
Stock Issued During Period, Shares, New Issues                 5,231,953     357,143        
Shares Issued, Price Per Share         $ 2.87   $ 2.87   $ 2.87 $ 2.87            
Proceeds from Issuance of Common Stock                 $ 15,000,000              
Stock Issued During Period, Value, New Issues                 14,995,000              
Stock Issuance Program, Authorized Amount                               $ 15,500,000
Proceeds from Issuance of Private Placement                   $ 15,500,000   $ 500,000        
Proceeds from Issuance of Private Placement, Net                       $ 324,000        
Stock Issued During Period, Shares, Issued for Services                       321,429        
Proceeds from Issuance of Common Stock, Net           $ 15,000,000              
The 2019 ATM Offering [Member]                                
Stock Issued During Period, Shares, New Issues               0                
Stock Issuance Program, Authorized Amount           $ 40,000,000         $ 40,000,000          
The 2018 ATM Offering [Member]                                
Stock Issued During Period, Shares, New Issues               77,349 2,017,046              
Shares Issued, Price Per Share       $ 2.37 $ 3.49   $ 3.49 $ 2.37 $ 3.49 $ 3.49            
Proceeds from Issuance of Common Stock             $ 11,200,000 $ 183,000 $ 7,000,000              
Stock Issued During Period, Value, New Issues               178,000 $ 6,818,000              
Stock Issuance, Percent of Cash Commission to Broker         3.00%   3.00%   3.00% 3.00%            
Stock Issuance Program, Authorized Amount                             $ 30,000,000  
Proceeds from Issuance of Common Stock, Net       $ 1,579,000   $ 10,900,000 $ 178,000 $ 6,827,000