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Note 14 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 29, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2016
Executive Chairman [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,068,966        
Proceeds from Issuance or Sale of Equity $ 3,000        
Mr. Elwood Norris [Member]          
Reimbursement of Expenses to Related Party, Monthly Amount       $ 1,500  
Consulting Fees to Related Party, Monthly Amount       7,500  
Related Party Transaction, Amounts of Transaction   $ 17,000 $ 80,000    
Mr. Elwood Norris [Member] | Related Party Technology License Agreement [Member]          
Royalty Payments, Percentage of Product Revenue         4.00%
Maximum Royalties to Be Paid Under Agreement         $ 1,000,000
Royalty Expense   0 $ 61,000    
Series A Preferred Stock [Member]          
Dividends Payable   818,000   818,000  
Series A Preferred Stock [Member] | Executive Chairman [Member]          
Stock Issued During Period, Shares, New Issues 3,000        
Dividends Payable   $ 120,000   $ 120,000