Note 2 - Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Allowance for credit losses, beginning of year	$ 73,728	$ 68,620
Current period provision	(827)	5,108
Write-off	(856)	0
Allowance for credit losses, end of year	$ 72,045	$ 73,728