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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]    
Net revenue $ 39,230,000 $ 40,017,000
Costs and expenses:    
Production costs 31,724,000 32,194,000
Product engineering and development 1,422,000 1,422,000
Selling, general and administrative 6,878,000 6,427,000
Total costs and expenses 40,024,000 40,043,000
Operating loss (794,000) (26,000)
Other income (expense), net:    
Interest and dividend income, net of fees 883,000 1,787,000
Realized and unrealized gains (losses) on marketable securities, net (3,638,000) 2,212,000
Other 3,000 440,000
Other income (expense), net (2,752,000) 4,439,000
Income (loss) before income tax expense (benefit) (3,546,000) 4,413,000
Income tax expense (benefit) (1,727,000) 940,000
Net income (loss) $ (1,819,000) $ 3,473,000
Basic earnings per common share:    
Net income (loss) $ (0.19) $ 0.36
Diluted earnings per common share:    
Net income (loss) $ (0.19) $ 0.36