Note 10 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($)			3 Months Ended			6 Months Ended
	Nov. 10, 2022	Aug. 11, 2022	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	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
Registration Rights Agreement [Member]
Common Stock, Maximum Shares Sold (in shares)									4,500,000
Common Stock Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)			0
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)									$ 0.001
Amortization of Commitment Fee			$ 76,673			$ 92,495
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Prepaid Expenses and Other Current Assets [Member]
Commitment Fee, Fair Value Disclosure								$ 150,000
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Commitment Fee [Member]
Stock Issued During Period, Shares, New Issues (in shares)	29,945	89,835
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Common Stock Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)						74,286
Shares Issued, Price Per Share (in dollars per share)			$ 0.72			$ 0.72
Shares Issued, Fees Per Share (in dollars per share)			$ 0.04			$ 0.04
Stock Issued During Period, Value, New Issues					$ 0	$ 53,453	$ 0