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Note 3 - Property and Equipment (Tables)
6 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
2019
   
June 30,
2019
 
Machinery and equipment
  $
2,222,670
    $
2,222,670
 
Buildings and structures
   
401,470
     
401,470
 
Computers and office equipment
   
173,245
     
173,245
 
     
2,797,385
     
2,797,385
 
Less accumulated depreciation
   
(2,795,463
)
   
(2,794,769
)
    $
1,922
    $
2,616