Quarterly report pursuant to Section 13 or 15(d)

Note 10 - 2021 Registered Direct Offering (Details Textual)

v3.22.4
Note 10 - 2021 Registered Direct Offering (Details Textual) - USD ($)
Dec. 31, 2022
Feb. 17, 2021
Feb. 11, 2021
Stock Issued During Period, Shares, New Issues 4,000,000 215,625  
Series K Warrant [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 161,719   161,719
Warrants and Rights Outstanding, Term     5 years 6 months
Placement Agent 2 Warrants [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 16,172   16,172
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 40.00
Warrants and Rights, Percent of Stock Oustanding Callable     7.50%
The 2021 Registered Direct Offering [Member]      
Stock Issued During Period, Shares, New Issues     215,625
Shares Issued, Price Per Share     $ 32.00
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 34.00
Proceeds from Issuance or Sale of Equity, Total     $ 6,900,000
Payments of Stock Issuance Costs     700,000
The 2021 Registered Direct Offering [Member] | Non-accountable Expense Fee [Member]      
Securities Purchase Agreement, Potential Fees     10,000
The 2021 Registered Direct Offering [Member] | Fees and Expenses of Legal Counsel and Other Out-of-pocket Expenses [Member]      
Securities Purchase Agreement, Potential Fees     50,000
The 2021 Registered Direct Offering [Member] | Clearing Expenses [Member]      
Securities Purchase Agreement, Potential Fees     $ 10,000
The 2021 Registered Direct Offering [Member] | Participating Investors [Member]      
Securities Purchase Agreement, Cash Placement Fee     7.50%
The 2021 Registered Direct Offering [Member] | Certain Investors With Pre-existing Relationships [Member]      
Securities Purchase Agreement, Cash Placement Fee     6.00%