Note 2 - Accounts Receivable - Accounts Receivable (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Accounts receivable - current	$ 1,847,784	$ 2,416,790
Less allowance for credit losses	(64,636)	(73,728)
Accounts receivable current - net	1,783,148	2,343,062
Accounts receivable - long-term	$ 633,629	$ 1,011,355

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

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