Note 10 - Common Stock Purchase Agreement (Details Textual) - USD ($)		3 Months Ended
	Jul. 08, 2022	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001				$ 0.001
Stock Issued During Period, Value, New Issues		$ 1,999,500	$ 2,800,000	$ 198,555	$ 495,999
Registration Rights Agreement [Member]
Common Stock, Maximum Shares Sold (in shares)	4,500,000
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
Stock Issued During Period, Shares, New Issues (in shares)		0
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Registration Rights Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	89,835
Stock Issued During Period, Value, New Issues	$ 112,500