Consolidated Statements of Operations (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net revenue	$ 40,017,000	$ 48,943,000
Costs and expenses:
Production costs	32,194,000	37,940,000
Product engineering and development	1,422,000	1,713,000
Selling, general and administrative	6,427,000	6,712,000
Total operating expenses	40,043,000	46,365,000
Income (loss) from operations	(26,000)	2,578,000
Other income (expense), net:
Interest and dividend income, net of fees	1,787,000	2,281,000
Realized and unrealized gains on marketable securities, net	2,212,000	1,456,000
Other	440,000	18,000
Other income (expense), net	4,439,000	3,755,000
Income before income taxes	4,413,000	6,333,000
Income tax expense (benefit)	940,000	(392,000)
Net income	$ 3,473,000	$ 6,725,000
Basic earnings per common share:
Basic earnings per share	$ 0.36	$ 0.71
Diluted earnings per common share:
Diluted earnings per share	$ 0.36	$ 0.71