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Note 6 - Equipment and Leasehold Improvements (Tables)
 12 Months Ended
Jun. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Estimated
      
 
 
    
 
 
   
useful lives (in years)
    
2020
    
2019
  
Machinery and equipment
  
5
-
10
     $
593,595
     $
593,595
  
Furniture and office equipment
  
5
-
10
      
357,351
      
357,351
  
Tooling
  
5
      
4,310,917
      
4,261,077
  
Computer equipment
  
3
-
5
      
658,028
      
758,819
  
Leasehold improvements
  
3
-
10
      
2,682,933
      
2,517,226
  
Assets in progress
  
N/A
      
327,348
      
118,737
  
   
 
      
8,930,172
      
8,606,805
  
Less: accumulated depreciation and amortization
  
 
      
7,946,531
      
7,716,695
  
Equipment and leasehold improvements, net
  
 
     $
983,641
     $
890,110