Note 3 - Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Balance, beginning of period	$ 61,923	$ 66,526	$ 66,526
Provision for doubtful accounts	18,416	$ 36,250	13,986
Write-offs	0		(18,589)
Balance, end of period	$ 80,339		$ 61,923