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Consolidated Statements Of Operations (USD $)
 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements Of Operations [Abstract]    
Net revenue $ 59,692,000 $ 55,587,000
Costs and expenses:    
Production costs 50,278,000 46,436,000
Product engineering and development 2,211,000 2,700,000
Selling, general and administrative 8,946,000 9,500,000
Total operating expenses 61,435,000 58,636,000
Operating loss (1,743,000) (3,049,000)
Other income (expenses):    
Interest and dividend income, net of fees 2,256,000 3,101,000
Income from investees   163,000
Realized and unrealized gains (losses) on marketable securities (3,113,000) 1,361,000
Other 66,000 783,000
Other income (expense) total (791,000) 5,408,000
Income (loss) before income taxes (2,534,000) 2,359,000
Income tax benefit (2,758,000) (610,000)
Net income $ 224,000 $ 2,969,000
Basic earnings per common share:    
Net income $ 0.02 $ 0.31
Diluted earnings per common share:    
Net income $ 0.02 $ 0.31