Note 1 - General Information (Details Textual) shares in Thousands	Dec. 05, 2022 shares	Dec. 31, 2023 $ / shares	Jun. 30, 2023 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Stock Issued During Period, Shares, Reverse Stock Splits (in shares) | shares	0
Number of Patents Granted		18
Number of Locations using TRACER 1000		29
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	30