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Note 3 - Property and Equipment (Tables)
 9 Months Ended
Mar. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
2021
     June 30,
2020		  
Machinery and equipment
   $
2,222,670
     $
2,222,670
  
Buildings and structures
    
401,470
      
401,470
  
Computers and office equipment
    
171,485
      
171,485
  
     
2,795,625
      
2,795,625
  
Less accumulated depreciation
    
(2,794,877
)
    
(2,794,257
)
    $
748
     $
1,368