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Note 12 - Subsequent Events (Details Textual) - Forecast [Member]
Aug. 22, 2022
USD ($)
Apr. 30, 2022
Sep. 02, 2022
USD ($)
shares
Apr. 18, 2022
USD ($)
Stock Issued During Period, Value, Issued for Services $ 1,500,000      
Lay Sciences, Inc [Member]        
Number of Preferred Stock Issuable (in shares) | shares     500,000  
Maximum Payment Payable Within 30 Days of Execution of Binding Letter of Intent     $ 500,000  
Employee Severance [Member]        
Restructuring and Related Cost, Number of Positions Eliminated   14    
Letter of Credit [Member] | Avenue Venture Opportunities Fund, L.P [Member] | Debt Instrument, Debt Default, Avenue Ventures Notes Payable [Member]        
Debt Instrument, Debt Default, Foreclosed Cash       $ 4,827,290
Long-Term Debt, Gross       $ 5,711,049