Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Preferred Stock, Shares Authorized (in shares)	20,000,000	20,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	200,000,000	200,000,000
Common Stock, Shares, Outstanding (in shares)	4,033,293	3,938,160
Series B Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	2,300,000	2,300,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Outstanding (in shares)	79,246	79,246