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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Net sales:        
Product $ 8,060,217 $ 6,846,129 $ 15,798,831 $ 11,585,577
Engineering development contracts 4,434,799 1,368,845 7,801,996 3,166,131
Total net sales 12,495,016 8,214,974 23,600,827 14,751,708
Cost of sales:        
Product 3,880,669 2,602,547 7,679,526 4,762,996
Engineering development contracts 4,829,222 1,661,033 8,355,740 2,997,067
Total cost of sales 8,709,891 4,263,580 16,035,266 7,760,063
Gross profit 3,785,125 3,951,394 7,565,561 6,991,645
Operating expenses:        
Research and development 660,876 805,126 1,287,797 1,655,978
Selling, general and administrative 2,034,609 1,935,431 3,779,500 3,740,240
Total operating expenses 2,695,485 2,740,557 5,067,297 5,396,218
Operating income 1,089,640 1,210,837 2,498,264 1,595,427
Interest income 5,299 6,181 10,965 23,753
Other income 8,901 13,261 19,368 24,806
Income before income taxes 1,103,840 1,230,279 2,528,597 1,643,986
Income tax expense 319,623 123,151 735,784 219,271
Net income $ 784,217 $ 1,107,128 $ 1,792,813 $ 1,424,715
Net income per common share:        
Basic (in dollars per share) $ 0.05 $ 0.07 $ 0.11 $ 0.09
Diluted (in dollars per share) $ 0.05 $ 0.07 $ 0.10 $ 0.09
Cash dividends per share (in dollars per share):       $ 1.50
Weighted average shares outstanding:        
Basic (in shares) 16,915,823 16,776,924 16,901,955 16,692,715
Diluted (in shares) 17,152,678 16,781,756 17,123,512 16,695,135