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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net revenue $ 22,986,000 $ 23,015,000 $ 49,189,000 $ 47,527,000
Costs and expenses:        
Production costs 17,237,000 18,756,000 38,651,000 39,617,000
Product engineering and development 670,000 547,000 1,764,000 1,610,000
Selling, general and administrative 2,678,000 2,265,000 6,999,000 6,662,000
Total operating expenses 20,585,000 21,568,000 47,414,000 47,889,000
Operating income (loss) 2,401,000 1,447,000 1,775,000 (362,000)
Other income (expenses):        
Interest and dividend income, net of fees 581,000 565,000 1,704,000 1,469,000
Net realized and unrealized gains (losses) on marketable securities (1,290,000) (530,000) 3,548,000 2,838,000
Other 13,000 17,000 49,000 42,000
Other income (expense) total (696,000) 52,000 5,301,000 4,349,000
Income before income tax expense (benefit) 1,705,000 1,499,000 7,076,000 3,987,000
Income tax expense (benefit) 513,000 409,000 2,243,000 (659,000)
Net Income $ 1,192,000 $ 1,090,000 $ 4,833,000 $ 4,646,000
Basic Income per Common Share:        
Net income per share $ 0.13 $ 0.11 $ 0.51 $ 0.49
Diluted Income per Common Share:        
Net income per share $ 0.13 $ 0.11 $ 0.51 $ 0.49