Note 7 - Convertible Notes (Details Textual) - USD ($)	1 Months Ended		3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2024	Mar. 31, 2023
Liabilities, Fair Value Adjustment			$ (0)	$ 858,000
Convertible Debt [Member]
Liabilities, Fair Value Adjustment				$ 900,000
The 2020 Notes [Member]
Proceeds from Issuance of Long-Term Debt		$ 5,100,000
The 2021 Notes [Member]
Proceeds from Issuance of Long-Term Debt	$ 6,000,000