Note 13 - Subsequent Events (Details Textual)	12 Months Ended
	Dec. 31, 2022 $ / shares
Preferred Stock, Number of Votes, Per One-thousandth of A Share (in dollars per share)	1,000
Series F Preferred Stock [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.001
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Preferred Stock, Number of Votes, Per Share	1,000,000