Note 3 - Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Balance, beginning of period	$ 61,923	$ 66,526	$ 66,526
Provision for doubtful accounts	94,597	$ 4,431	13,986
Write-offs	(1,535)		(18,589)
Balance, end of period	$ 154,985		$ 61,923