Note 1 - Description of Business and Significant Accounting Policies - Schedule of Common Stock Equivalents Outstanding (Details) - shares	Dec. 31, 2023	Dec. 31, 2022
Common stock equivalents (in shares)	65,417,500	65,623,500
Series C Preferred Stock [Member]
Common stock equivalents (in shares)	40,630,000	40,630,000
Share-Based Payment Arrangement, Option [Member]
Common stock equivalents (in shares)	24,787,500	24,993,500