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Note 5 - Equipment and Leasehold Improvements - Major Categories of Equipment and Leasehold Improvements (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Equipment and leasehold improvements, gross $ 8,606,805 $ 8,495,239
Less: accumulated depreciation and amortization 7,716,695 7,363,134
Equipment and leasehold improvements, net 890,110 1,132,105 [1]
Machinery and Equipment [Member]    
Equipment and leasehold improvements, gross $ 593,595 593,595
Machinery and Equipment [Member] | Minimum [Member]    
Estimated useful life (Year) 5 years  
Machinery and Equipment [Member] | Maximum [Member]    
Estimated useful life (Year) 10 years  
Furniture and Fixtures [Member]    
Equipment and leasehold improvements, gross $ 357,351 357,351
Furniture and Fixtures [Member] | Minimum [Member]    
Estimated useful life (Year) 5 years  
Furniture and Fixtures [Member] | Maximum [Member]    
Estimated useful life (Year) 10 years  
Tooling [Member]    
Estimated useful life (Year) 5 years  
Equipment and leasehold improvements, gross $ 4,261,077 4,308,967
Computer Equipment [Member]    
Equipment and leasehold improvements, gross $ 758,819 758,820
Computer Equipment [Member] | Minimum [Member]    
Estimated useful life (Year) 3 years  
Computer Equipment [Member] | Maximum [Member]    
Estimated useful life (Year) 5 years  
Leasehold Improvements [Member]    
Equipment and leasehold improvements, gross $ 2,517,226 2,457,006
Leasehold Improvements [Member] | Minimum [Member]    
Estimated useful life (Year) 3 years  
Leasehold Improvements [Member] | Maximum [Member]    
Estimated useful life (Year) 10 years  
Asset under Construction [Member]    
Equipment and leasehold improvements, gross $ 118,737 $ 19,500
[1] As adjusted for the retrospective adoption of ASC 606 and ASC 842