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 ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 11 Months Ended 15 Months Ended
Jun. 03, 2019
May 13, 2019
Jun. 08, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 07, 2019
Jun. 30, 2019
Jun. 30, 2018
May 30, 2018
Mar. 27, 2018
June 2019 Public Offering [Member]                        
Stock Issued During Period, Shares, New Issues (in shares) 11,500,000                      
Shares Issued, Price Per Share (in dollars per share) $ 1.85                      
Proceeds from Issuance of Common Stock, Gross $ 21,275                      
Proceeds from Issuance of Common Stock, Net of Share Issuance Costs $ 19,594                      
Stock Issuance, Percent of Cash Commission to Broker 7.00%                      
The 2019 Share Purchase Agreement [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)   171,428                    
Stock Issuance Program, Authorized Amount               $ 20,000        
Stock Issued During Period, Value, New Issues   $ 360         $ 360          
The 2018 Purchase Agreement [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)     170,261       5,502,433 6,409,980        
Shares Issued, Price Per Share (in dollars per share)         $ 1.82   $ 1.82   $ 1.82      
Proceeds from Issuance of Common Stock, Gross             $ 10,000 $ 11,900        
Stock Issuance Program, Authorized Amount                     $ 20,000  
Stock Issued During Period, Value, New Issues     $ 600       10,000          
Proceeds from Issuance of Common Stock       $ 4,000 $ 10,000 $ 11,900        
The 2018 ATM Offering [Member]                        
Stock Issued During Period, Shares, New Issues (in shares)             77,349          
Shares Issued, Price Per Share (in dollars per share)         $ 2.37   $ 2.37   $ 2.37      
Proceeds from Issuance of Common Stock, Gross             $ 183   $ 11,200      
Stock Issuance, Percent of Cash Commission to Broker                   3.00%    
Stock Issuance Program, Authorized Amount                       $ 30,000
Stock Issued During Period, Value, New Issues             178          
Proceeds from Issuance of Common Stock       $ 178   $ 10,900