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Note 5 - Fixed Assets - Fixed Assets (Details) - USD ($)
6 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Less accumulated depreciation and amortization $ (504,000) $ (484,000)
Fixed assets, net 89,663 258,516
Manufacturing Equipment [Member]    
Fixed assets, gross $ 112,000 112,000
Manufacturing Equipment [Member] | Minimum [Member]    
Estimated useful life (Year) 2 years  
Manufacturing Equipment [Member] | Maximum [Member]    
Estimated useful life (Year) 5 years  
Leasehold Improvements [Member]    
Estimated useful life (Year) 3 years  
Fixed assets, gross $ 111,000 229,000
Office Equipment, Furniture and Other [Member]    
Fixed assets, gross $ 281,000 312,000
Office Equipment, Furniture and Other [Member] | Minimum [Member]    
Estimated useful life (Year) 2 years  
Office Equipment, Furniture and Other [Member] | Maximum [Member]    
Estimated useful life (Year) 5 years  
Lab Equipment [Member]    
Fixed assets, gross $ 90,000 $ 90,000
Lab Equipment [Member] | Minimum [Member]    
Estimated useful life (Year) 3 years  
Lab Equipment [Member] | Maximum [Member]    
Estimated useful life (Year) 5 years