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Note 1 - Nature of Operations, Principles of Consolidation and Basis of Presentation of Interim Financial Statements (Tables)
9 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

March 31,

  

March 31,

 
  

2024

  

2023

  

2024

  

2023

 
                 

Anti-dilutive stock options

  2,393,183   427,000   4,758,183   1,286,983 

Total anti-dilutive shares

  2,439,183   427,000   4,758,183   1,286,983