Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operations:
Net income	$ 4,472,000	$ 224,000
Adjustments to reconcile net income to cash provided by operations:
Purchases of marketable securities	(67,123,000)	(89,242,000)
Proceeds from sale and maturity of marketable securities	62,363,000	87,531,000
Change in value of marketable securities	(4,129,000)	2,553,000
Deferred income taxes	2,161,000	(3,052,000)
Depreciation and amortization	1,075,000	890,000
Provision for doubtful accounts	366,000	190,000
Loss on disposal of assets	28,000
Stock-based compensation	189,000	47,000
Change in assets and liabilities:
Accounts receivable	1,000	468,000
Costs and estimated earnings in excess of billings	1,002,000	(3,870,000)
Inventories	960,000	4,463,000
Prepaid expenses	850,000	573,000
Account payable	(97,000)	605,000
Customer deposits	(276,000)	(722,000)
Accrued expenses and other	675,000	(481,000)
Total adjustments	(1,955,000)	(47,000)
Cash flows provided by operations	2,517,000	177,000
Cash flows from investing activities:
Capital expenditures, net of disposals	(871,000)	(1,466,000)
Cash flows used by investing activities	(871,000)	(1,466,000)
Net increase (decrease) in cash	1,646,000	(1,289,000)
Cash and cash equivalents at:
Beginning of period	1,715,000	3,004,000
End of period	$ 3,361,000	$ 1,715,000