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Note 3 - Property and Equipment (Tables)
 6 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
2018
    
June 30,
2018
  
Machinery and equipment
   $
2,222,670
     $
2,222,670
  
Buildings and structures
    
401,470
      
401,470
  
Computers and office equipment
    
171,720
      
171,613
  
     
2,795,860
      
2,795,753
  
Less accumulated depreciation
    
(2,794,149
 )    
(2,794,305
 )
    $
1,711
     $
1,448