Note 7 - Derivative Liabilities (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Derivative Liability, Current	$ 6,024,000		$ 5,292,000
Derivative, Gain (Loss) on Derivative, Net, Total	(667,000)	$ 1,172,000
Series D Preferred Stock Instrument [Member]
Derivative Liability, Current	6,024,000	5,292,000	$ 5,292,000
Derivative, Gain (Loss) on Derivative, Net, Total	$ 667,000	$ 1,172,000

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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