Note 3 - Fair Value Accounting - Derivative Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Change in fair value included in earnings	$ 18,809,000	$ 2,252,000
Fair value at end of year	5,292,000
Fair Value, Inputs, Level 3 [Member]
Fair value at beginning of year	24,128,000	369,000
Change in fair value included in earnings	(18,809,000)	(2,252,000)
Fair value at end of year	5,292,000	24,128,000
Fair Value, Inputs, Level 3 [Member] | Series D Preferred Stock [Member]
Derivative liability from issuance of Preferred Series D	558,000	26,011,000
Decrease in derivative liability from conversion of Preferred Series D	$ (585,000)	$ 0