Note 3 - Fair Value Accounting (Details Textual)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 20, 2020 USD ($)
Derivative Liability, Current	$ 5,292,000	$ 24,128,000
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]
Derivative Liability, Measurement Input	0.0026
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]
Derivative Liability, Measurement Input	0.0097
Measurement Input, Price Volatility [Member] | Minimum [Member]
Derivative Liability, Measurement Input	0.980
Measurement Input, Price Volatility [Member] | Maximum [Member]
Derivative Liability, Measurement Input	1.1810
Measurement Input, Expected Term [Member]
Derivative Liability, Measurement Input	4.0
Measurement Input, Expected Dividend Rate [Member]
Derivative Liability, Measurement Input	0.040
Series D Preferred Stock Instrument [Member]
Derivative Liability, Current	$ 5,292,000	$ 24,128,000	$ 26,011,000