Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Preferred Stock, Shares Authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, Shares, Outstanding (in shares)	43,289,236	41,175,993
Common stock, shares issued (in shares)	43,289,236	41,175,993
Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	10,000	10,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Issued (in shares)	10,000	0
Preferred Stock, Shares Outstanding (in shares)	10,000	0