Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Share Capital (Details Textual)

v3.19.2
Note 9 - Share Capital (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended 13 Months Ended 15 Months Ended
Jun. 03, 2019
May 13, 2019
May 07, 2019
Jun. 08, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2019
May 24, 2019
May 30, 2018
Mar. 28, 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 $ 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                          
Stock Issuance Program, Authorized Amount     $ 20,000,000                          
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       $ 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     360,000 600,000                
Stock Issuance Program, Authorized Amount                           $ 20,000,000    
Proceeds from Issuance of Common Stock, Net         $ 4,000,000 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              
Proceeds from Issuance of Common Stock               $ 15,000,000                
Stock Issued During Period, Value, New Issues             10,000,000 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         $ 6,140,000 $ 15,000,000                
The 2019 ATM Offering [Member]                                
Stock Issued During Period, Shares, New Issues             0                  
Stock Issuance Program, Authorized Amount                         $ 40,000,000      
The 2018 ATM Offering [Member]                                
Stock Issued During Period, Shares, New Issues             77,349 1,429,847                
Shares Issued, Price Per Share         $ 2.37 $ 3.78 $ 2.37 $ 3.78 $ 3.78   $ 2.37 $ 2.37        
Proceeds from Issuance of Common Stock             $ 183,000 $ 5,410,000       $ 11,200,000        
Stock Issued During Period, Value, New Issues             178,000 $ 5,246,000                
Stock Issuance, Percent of Cash Commission to Broker           3.00%   3.00% 3.00%              
Stock Issuance Program, Authorized Amount                             $ 30,000,000  
Proceeds from Issuance of Common Stock, Net         $ 5,248,000 $ 178,000 $ 5,248,000       $ 10,900,000