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Note 3 - Contracts With Customers (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
Sep. 30, 2025
USD ($)
Sep. 30, 2024
Dec. 31, 2024
USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current $ 26,009   $ 26,009   $ 34,154
Accounts Receivable, Allowance for Credit Loss, Current 0   0   0
Contract with Customer, Liability $ 146,576   146,576   $ 224,076
Contract with Customer, Liability, Revenue Recognized     $ 77,500    
Revenue Benchmark [Member] | Customer Concentration Risk [Member]          
Number of Customers 1 1 1 2