Note 1 - General Information (Details Textual)	Dec. 31, 2022 $ / shares	Dec. 05, 2022 $ / shares	Jun. 30, 2022 $ / shares	[1]
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Number of Patents Granted	21
Number of Additional Patents In Process	1
Number of Wholly Owned Subsidiaries	3

[1] The balance sheet at June 30, 2022, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by the United States generally accepted accounting principles for complete financial statements.