Note 9 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Jul. 08, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001			$ 0.0001		$ 0.0001
Stock Issued During Period, Value, New Issues			$ 56,266
Proceeds from Issuance of Common Stock				$ 0	$ 56,266
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)							$ 0.0001
Common Stock, Maximum Shares Sold (in shares)							150,000
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Registration Rights Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	0
Stock Issued During Period, Value, New Issues		$ 0		$ 0	$ 2,479
Shares Issued, Average Price Per Share (in dollars per share)					$ 21.56
Shares Issued, Fees Per Share (in dollars per share)		$ 1.2			$ 1.2
Proceeds from Issuance of Common Stock					$ 53,453