Note 9 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Oct. 18, 2023	Jul. 08, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001		$ 0.001	$ 0.001
Stock Issued During Period, Value, New Issues		$ 37,631
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member]
Purchase Agreement, Maximum Amount to be Sold					$ 15,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001
Common Stock, Maximum Shares Sold (in shares)					450,000
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Registration Rights Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	0	7,429
Stock Issued During Period, Value, New Issues	$ 0	$ 53,453
Shares Issued, Average Price Per Share (in dollars per share)		$ 7.2
Shares Issued, Fees Per Share (in dollars per share)		$ 0.4