Note 4 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Accounts receivable	$ 3,802,570	$ 2,096,569
Allowance for credit losses	(623,785)	(573,785)
Accounts receivable, net of allowances for credit losses	$ 3,178,785	$ 1,522,784