Note 7 - Convertible Promissory Note - Convertible Promissory Note (Details) - Convertible Debt [Member] - The July 2019 Note [Member] - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 01, 2023	Jul. 31, 2023	Mar. 31, 2023	Jan. 31, 2023	Jul. 23, 2019
Maturity Date	Jan. 31, 2024	Jul. 31, 2023
Stated Interest Rate	24.00%	24.00%					24.00%
Conversion Price (in dollars per share)	$ 0.79	$ 6.3	$ 1.07	$ 1.07	$ 2.65	$ 2.87
Face Value	$ 397,000	$ 1,000,000					$ 1,000,000
Remaining Debt Discount	19,000	(38,000)
Carrying Value	$ 416,000	$ 962,000