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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]        
Net revenue $ 13,754,000us-gaap_SalesRevenueGoodsNet $ 14,541,000us-gaap_SalesRevenueGoodsNet $ 20,041,000us-gaap_SalesRevenueGoodsNet $ 24,560,000us-gaap_SalesRevenueGoodsNet
Costs and expenses:        
Production costs 10,121,000us-gaap_CostOfRevenue 10,851,000us-gaap_CostOfRevenue 16,063,000us-gaap_CostOfRevenue 19,338,000us-gaap_CostOfRevenue
Product engineering and development 357,000us-gaap_ResearchAndDevelopmentExpense 351,000us-gaap_ResearchAndDevelopmentExpense 686,000us-gaap_ResearchAndDevelopmentExpense 731,000us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 1,776,000us-gaap_SellingGeneralAndAdministrativeExpense 1,519,000us-gaap_SellingGeneralAndAdministrativeExpense 3,426,000us-gaap_SellingGeneralAndAdministrativeExpense 3,253,000us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses 12,254,000us-gaap_OperatingExpenses 12,721,000us-gaap_OperatingExpenses 20,175,000us-gaap_OperatingExpenses 23,322,000us-gaap_OperatingExpenses
Operating income (loss) 1,500,000us-gaap_OperatingIncomeLoss 1,820,000us-gaap_OperatingIncomeLoss (134,000)us-gaap_OperatingIncomeLoss 1,238,000us-gaap_OperatingIncomeLoss
Other income (expense), net:        
Interest and dividend income, net of fees 197,000us-gaap_InvestmentIncomeNet 490,000us-gaap_InvestmentIncomeNet 520,000us-gaap_InvestmentIncomeNet 1,430,000us-gaap_InvestmentIncomeNet
Net realized and unrealized gains (losses) on marketable securities 195,000us-gaap_MarketableSecuritiesGainLoss 685,000us-gaap_MarketableSecuritiesGainLoss (232,000)us-gaap_MarketableSecuritiesGainLoss 1,223,000us-gaap_MarketableSecuritiesGainLoss
Other   6,000us-gaap_OtherNonoperatingIncomeExpense   (8,000)us-gaap_OtherNonoperatingIncomeExpense
Other income (expense), net 392,000us-gaap_NonoperatingIncomeExpense 1,181,000us-gaap_NonoperatingIncomeExpense 288,000us-gaap_NonoperatingIncomeExpense 2,645,000us-gaap_NonoperatingIncomeExpense
Income before income tax expense 1,892,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 3,001,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 154,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 3,883,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense 708,000us-gaap_IncomeTaxExpenseBenefit 1,100,000us-gaap_IncomeTaxExpenseBenefit 65,000us-gaap_IncomeTaxExpenseBenefit 1,536,000us-gaap_IncomeTaxExpenseBenefit
Net income $ 1,184,000us-gaap_NetIncomeLoss $ 1,901,000us-gaap_NetIncomeLoss $ 89,000us-gaap_NetIncomeLoss $ 2,347,000us-gaap_NetIncomeLoss
Basic Income per Common Share:        
Net income per share $ 0.12us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ 0.01us-gaap_EarningsPerShareBasic $ 0.25us-gaap_EarningsPerShareBasic
Diluted Income per Common Share:        
Net income per share $ 0.12us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ 0.01us-gaap_EarningsPerShareDiluted $ 0.25us-gaap_EarningsPerShareDiluted