Annual report pursuant to Section 13 and 15(d)

Note 11 - Subsequent Events (Details Textual)

v3.23.1
Note 11 - Subsequent Events (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2023
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Aug. 01, 2018
Dec. 31, 2015
Stock Issued During Period, Shares, New Issues     10,323      
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs     $ 8,926,000 $ 0    
Payments of Stock Issuance Costs     $ 1,397,000      
Subscription Agreements [Member]            
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs   $ 8,900,000        
Payments of Stock Issuance Costs   $ 1,400,000        
Subsequent Event [Member] | Series A-5 Preferred Stock [Member] | Subscription Agreements [Member]            
Stock Issued During Period, Shares, New Issues 2,299          
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001          
Shares Issued, Price Per Share (in dollars per share) $ 1,000          
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs $ 2,000,000          
Payments of Stock Issuance Costs $ 299,000