Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Share Capital (Details Textual)

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Note 10 - Share Capital (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 10, 2023
May 25, 2023
Oct. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 09, 2022
May 05, 2020
2023 Committed Equity Facility [Member]                    
Stock issuance program authorized shares   25,156                
Stock Issuance Program, Authorized Amount   $ 25,000,000                
Percentage of common shares outstanding.   19.99%                
2023 Committed Equity Facility [Member] | Initial Commitment Shares [Member]                    
Common shares issued under the ATM Facility (in shares)   7,547                
Stock Issuance, Percent of Cash Commission to Broker   30.00%                
2023 Committed Equity Facility [Member] | First Back-End Commitment Shares [Member]                    
Common shares issued under the ATM Facility (in shares)   7,547                
Stock Issuance, Percent of Cash Commission to Broker   30.00%                
2023 Committed Equity Facility [Member] | Second Back-End Commitment Shares [Member]                    
Common shares issued under the ATM Facility (in shares)   10,062                
Stock Issuance, Percent of Cash Commission to Broker   40.00%                
The 2022 ATM Offering [Member]                    
Stock Issuance Program, Authorized Amount                 $ 50,000,000  
Common shares issued under the ATM Facility (in shares) 303,433         171,253   4,836    
Shares Issued, Price Per Share (in dollars per share) $ 5.90     $ 6.88   $ 6.88   $ 10.81    
Proceeds from Issuance of Common Stock, Gross $ 1,790,000         $ 1,200,000   $ 52,000    
Proceeds from Issuance of Common Stock $ 1,740,000     $ 1,109,000 $ 0 $ 1,143,000 $ 0 $ 51,000    
Stock Issuance, Percent of Cash Commission to Broker       3.00%   3.00%        
The 2020 ATM Offering [Member]                    
Stock Issuance Program, Authorized Amount                   $ 75,000,000
Common shares issued under the ATM Facility (in shares)             1,869 3,646    
Shares Issued, Price Per Share (in dollars per share)         $ 15.9   $ 15.9 $ 14.25    
Proceeds from Issuance of Common Stock, Gross     $ 89,000       $ 30,000 $ 52,000    
Proceeds from Issuance of Common Stock     $ 86,000       $ 29,000 $ 50,000    
Stock Issuance, Percent of Cash Commission to Broker     3.00%