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Condensed Consolidated Statements Of Operations (USD $)
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Condensed Consolidated Statements Of Operations [Abstract]    
Net revenue $ 6,864,000 $ 7,785,000
Costs and expenses:    
Production costs 6,141,000 6,809,000
Product engineering and development 539,000 529,000
Selling, general and administrative 1,797,000 2,103,000
Total operating expenses 8,477,000 9,441,000
Operating loss (1,613,000) (1,656,000)
Other income:    
Interest and dividend income, net of fees 570,000 609,000
Realized and unrealized gains on marketable securities 2,227,000 2,538,000
Other 16,000 19,000
Other income (expense) total 2,813,000 3,166,000
Income before income tax expense 1,200,000 1,510,000
Income tax expense 325,000 405,000
Net Income $ 875,000 $ 1,105,000
Basic Income per Common Share:    
Net income per share $ 0.09 $ 0.12
Diluted Income per Common Share:    
Net income per share $ 0.09 $ 0.12