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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sales:    
Product $ 3,475,171 $ 5,940,410
Engineering development contracts 348,876 643,168
Returns and allowances (458,181)  
Total net sales 3,365,866 6,583,578
Cost of sales:    
Product 1,740,703 2,908,957
Engineering development contracts 87,349 358,810
Total cost of sales 1,828,052 3,267,767
Gross profit 1,537,814 3,315,811
Operating expenses:    
Research and development 1,085,988 931,600
Selling, general and administrative 2,047,121 2,692,944
Total operating expenses 3,133,109 3,624,544
Operating loss (1,595,295) (308,733)
Interest income 9,876 7,025
Other income 19,114 32,410
Loss before income taxes (1,566,305) (269,298)
Income tax benefit (371,331) (53,860)
Net loss $ (1,194,974) $ (215,438)
Net loss per common share:    
Basic (in dollars per share) $ (0.07) $ (0.01)
Diluted (in dollars per share) $ (0.07) $ (0.01)
Weighted average shares outstanding:    
Basic (in shares) 16,716,014 16,909,638
Diluted (in shares) 16,716,014 16,909,638