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Condensed Consolidated Statements Of Operations (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Operations [Abstract]        
Net revenue $ 19,339,000 $ 16,727,000 $ 26,203,000 $ 24,512,000
Costs and expenses:        
Production costs 15,273,000 14,052,000 21,414,000 20,861,000
Product engineering and development 556,000 534,000 1,095,000 1,063,000
Selling, general and administrative 2,523,000 2,294,000 4,320,000 4,397,000
Total operating expenses 18,352,000 16,880,000 26,829,000 26,321,000
Operating income (loss) 987,000 (153,000) (626,000) (1,809,000)
Other income (expenses):        
Interest and dividend income, net of fees 553,000 511,000 1,123,000 904,000
Net realized and unrealized gains on marketable securities 2,611,000 614,000 4,838,000 3,368,000
Other 20,000 6,000 36,000 25,000
Other income (expense) total 3,184,000 1,131,000 5,997,000 4,297,000
Income before income tax expense (benefit) 4,171,000 978,000 5,371,000 2,488,000
Income tax expense (benefit) 1,405,000 (1,472,000) 1,730,000 (1,067,000)
Net Income $ 2,766,000 $ 2,450,000 $ 3,641,000 $ 3,555,000
Basic Income per Common Share:        
Net income per share $ 0.29 $ 0.26 $ 0.38 $ 0.37
Diluted Income per Common Share:        
Net income per share $ 0.29 $ 0.26 $ 0.38 $ 0.37