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Consolidated Statements of Operations (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]    
Net revenue $ 48,943,000 $ 63,182,000
Costs and expenses:    
Production costs 37,940,000 51,152,000
Product engineering and development 1,713,000 2,339,000
Selling, general and administrative 6,712,000 9,298,000
Total operating expenses 46,365,000 62,789,000
Operating income 2,578,000 393,000
Other income (expenses):    
Interest and dividend income, net of fees 2,281,000 2,269,000
Realized and unrealized gains (losses) on marketable securities, net 1,456,000 4,120,000
Other 18,000 70,000
Other income (expenses) total 3,755,000 6,459,000
Income before income taxes 6,333,000 6,852,000
Income tax expense (benefit) (392,000) 2,380,000
Net income $ 6,725,000 $ 4,472,000
Basic earnings per common share:    
Net income $ 0.71 $ 0.47
Diluted earnings per common share:    
Net income $ 0.71 $ 0.47