Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Product sales	$ 4,252,815us-gaap_SalesRevenueGoodsNet	$ 5,113,660us-gaap_SalesRevenueGoodsNet	$ 8,398,887us-gaap_SalesRevenueGoodsNet	$ 8,669,722us-gaap_SalesRevenueGoodsNet
Contract and other	233,415us-gaap_SalesRevenueServicesNet	273,646us-gaap_SalesRevenueServicesNet	472,771us-gaap_SalesRevenueServicesNet	540,214us-gaap_SalesRevenueServicesNet
Total revenues	4,486,230us-gaap_Revenues	5,387,306us-gaap_Revenues	8,871,658us-gaap_Revenues	9,209,936us-gaap_Revenues
Cost of revenues	2,189,425us-gaap_CostOfRevenue	2,658,050us-gaap_CostOfRevenue	4,215,696us-gaap_CostOfRevenue	4,536,129us-gaap_CostOfRevenue
Gross profit	2,296,805us-gaap_GrossProfit	2,729,256us-gaap_GrossProfit	4,655,962us-gaap_GrossProfit	4,673,807us-gaap_GrossProfit
Operating expenses:
Selling, general and administrative	1,466,197	1,630,965	2,868,219	3,055,509
Research and development	569,418us-gaap_ResearchAndDevelopmentExpense	575,851us-gaap_ResearchAndDevelopmentExpense	1,047,122us-gaap_ResearchAndDevelopmentExpense	969,392us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	2,035,615us-gaap_OperatingExpenses	2,206,816us-gaap_OperatingExpenses	3,915,341us-gaap_OperatingExpenses	4,024,901us-gaap_OperatingExpenses
Income from operations	261,190us-gaap_OperatingIncomeLoss	522,440us-gaap_OperatingIncomeLoss	740,621us-gaap_OperatingIncomeLoss	648,906us-gaap_OperatingIncomeLoss
Other income	30,921us-gaap_OtherNonoperatingIncomeExpense	5,086us-gaap_OtherNonoperatingIncomeExpense	57,124us-gaap_OtherNonoperatingIncomeExpense	10,283us-gaap_OtherNonoperatingIncomeExpense
Income from operations before income taxes	292,111	527,526	797,745	659,189
Income tax expense	1,600us-gaap_IncomeTaxExpenseBenefit	1,600us-gaap_IncomeTaxExpenseBenefit	1,600us-gaap_IncomeTaxExpenseBenefit	1,700us-gaap_IncomeTaxExpenseBenefit
Net income	$ 290,511us-gaap_NetIncomeLoss	$ 525,926us-gaap_NetIncomeLoss	$ 796,145us-gaap_NetIncomeLoss	$ 657,489us-gaap_NetIncomeLoss
Net income per common share - basic and diluted (in dollars per share)	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted	$ 0.02us-gaap_EarningsPerShareBasicAndDiluted	$ 0.02us-gaap_EarningsPerShareBasicAndDiluted	$ 0.02us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding:
Basic (in shares)	33,253,719	33,133,915	33,244,929	33,080,702
Diluted (in shares)	33,847,965	34,040,509	33,816,805	33,756,467

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