Note 7 - Convertible Promissory Note - Convertible Promissory Note (Details) - Convertible Debt [Member] - The July 2019 Note [Member] - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Oct. 31, 2022	Jul. 25, 2022	Jul. 23, 2019
Maturity Date	Jul. 31, 2023	Jul. 31, 2022
Stated Interest Rate	24.00%	24.00%			24.00%
Conversion Price (in dollars per share)	$ 6.30	$ 40.95	$ 6.30	$ 9.45	$ 81.00
Face Value	$ 1,000,000	$ 1,000,000			$ 1,000,000
Remainging unamortized discount	(38,000)	(187,000)	$ (112,000)
Carrying Value	$ 962,000	$ 813,000