Note 1 - Description of Business and Summary of Significant Accounting Policies - Summary of Deferred Revenue (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred revenues, beginning of period	$ 17,647	$ 66,572
Deferred revenues, end of period	0	17,647
Revenue recognized in the period from amounts included in deferred revenues at the beginning of the period	$ 17,647	$ 48,925