Consolidated Statements of Operations (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Operations [Abstract]
Net revenue	$ 63,182,000	$ 59,692,000
Costs and expenses:
Production costs	51,152,000	50,278,000
Product engineering and development	2,339,000	2,211,000
Selling, general and administrative	9,298,000	8,946,000
Total operating expenses	62,789,000	61,435,000
Operating income (loss)	393,000	(1,743,000)
Other income (expenses):
Interest and dividend income, net of fees	2,269,000	2,256,000
Realized and unrealized gains (losses) on marketable securities	4,120,000	(3,113,000)
Other	70,000	66,000
Other income (expense) total	6,459,000	(791,000)
Income (loss) before income taxes	6,852,000	(2,534,000)
Income tax expense (benefit)	2,380,000	(2,758,000)
Net income	$ 4,472,000	$ 224,000
Basic earnings per common share:
Net income	$ 0.47	$ 0.02
Diluted earnings per common share:
Net income	$ 0.47	$ 0.02