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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]        
Net revenue $ 14,541,000 $ 17,737,000 $ 24,560,000 $ 22,685,000
Costs and expenses:        
Production costs 10,851,000 13,411,000 19,338,000 17,942,000
Product engineering and development 351,000 454,000 731,000 902,000
Selling, general and administrative 1,519,000 1,984,000 3,253,000 3,943,000
Total operating expenses 12,721,000 15,849,000 23,322,000 22,787,000
Operating income (loss) 1,820,000 1,888,000 1,238,000 (102,000)
Other income (expense), net:        
Interest and dividend income, net of fees 490,000 553,000 1,430,000 1,243,000
Net realized and unrealized gains on marketable securities 685,000 1,269,000 1,223,000 743,000
Other 6,000   (8,000) 15,000
Other income (expense), net 1,181,000 1,822,000 2,645,000 2,001,000
Income before income tax expense (benefit) 3,001,000 3,710,000 3,883,000 1,899,000
Income tax expense (benefit) 1,100,000 733,000 1,536,000 (102,000)
Net income $ 1,901,000 $ 2,977,000 $ 2,347,000 $ 2,001,000
Basic Income per Common Share:        
Net income per share $ 0.20 $ 0.31 $ 0.25 $ 0.21
Diluted Income per Common Share:        
Net income per share $ 0.20 $ 0.31 $ 0.25 $ 0.21