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