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 4 Months Ended 12 Months Ended
Oct. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 09, 2022
May 05, 2020
The 2022 ATM Offering [Member]                
Stock Issuance Program, Authorized Amount             $ 50,000,000  
Common shares issued under the 2022 ATM Facility (in shares)   46,427     72,541      
Shares Issued, Price Per Share (in dollars per share)   $ 0.75   $ 0.75 $ 0.72      
Proceeds from Issuance of Common Stock, Gross   $ 35,000   $ 87,000 $ 52,000      
Proceeds from Issuance of Common Stock   $ 34,000 $ 0 $ 85,000 $ 51,000      
Stock Issuance, Percent of Cash Commission to Broker   3.00%   3.00% 3.00%      
The 2020 ATM Offering [Member]                
Stock Issuance Program, Authorized Amount               $ 75,000,000
Common shares issued under the 2022 ATM Facility (in shares)     0   54,687 15,315    
Shares Issued, Price Per Share (in dollars per share)         $ 0.95 $ 2.446    
Proceeds from Issuance of Common Stock, Gross $ 89,000       $ 52,000 $ 37,000    
Proceeds from Issuance of Common Stock $ 86,000       $ 50,000 $ 36,000    
Stock Issuance, Percent of Cash Commission to Broker 3.00%       3.00%