Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Retained Earnings (Accumulated Deficit), Total	$ (154,442,000)	$ (152,175,000)
Cash and Cash Equivalents, at Carrying Value, Total	$ 949,000	$ 1,103,000
Cash, Percentage Held in One Financial Institution	95.00%
Cash, Uninsured Amount	$ 652,000