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Note 4 - Revolving Line of Credit (Details Textual) - Revolving Credit Facility [Member] - USD ($)
 12 Months Ended
Dec. 31, 2022
May 31, 2022
Line of Credit Facility, Current Borrowing Capacity $ 131,000  
Long-Term Line of Credit, Total $ 0  
Susser Bank, National Association [Member]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,500,000
Line of Credit Facility, Borrowing Base, Percent of Receivables   80.00%
Debt Instrument, Interest Rate, Effective Percentage 7.50%  
Debt Instrument, Interest Rate, Minimum Interest Rate Required   3.50%
Line of Credit Facility, Line of Credit Facility, Loan Origination Fee 0.50%  
Line of Credit Facility, Minimum Liquidity Threshold   $ 1,500,000