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Note 3 - Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Balance, beginning of period $ 66,526 $ 102,515
Provision for doubtful accounts 13,986 (15,761)
Write-offs (18,589) (20,228)
Balance, end of period $ 61,923 $ 66,526