Note 2 - Going Concern (Details Textual) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 10,014,000	$ 7,161,000
Working Capital	6,413,000
Retained Earnings (Accumulated Deficit), Ending Balance	$ (255,696,000)	$ (253,283,000)