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Note 8 - Line of Credit (Details Textual) - USD ($)
1 Months Ended 2 Months Ended
May 04, 2022
Dec. 29, 2021
May 20, 2022
May 23, 2022
Mar. 31, 2022
Nantahala Capital Management, LLC [Member]          
Ownership Interest   37.30%      
Term Loan and Security Agreement [Member] | Secured Term Loan Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500,000     $ 2,500,000
Proceeds from Issuance of Long-Term Debt, Total   $ 600,000      
Term Loan and Security Agreement [Member] | Secured Term Loan Credit Facility [Member] | Subsequent Event [Member]          
Proceeds from Issuance of Long-Term Debt, Total $ 1,450,000   $ 1,450,000 $ 400,000  
Long-Term Line of Credit, Total     342,000    
Line of Credit Facility, Remaining Borrowing Capacity     $ 342,000