Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operations:
Net Income	$ 3,473,000	$ 6,725,000
Adjustments to reconcile net income to cash provided by (used in) operations:
Purchase of marketable securities	(351,062,000)	(64,516,000)
Proceeds from sale and maturity of marketable securities	348,845,000	64,068,000
Change in value of marketable securities	(1,782,000)	(1,290,000)
Deferred income taxes	209,000	(490,000)
Depreciation and amortization	1,372,000	1,232,000
Provision for doubtful accounts	60,000	65,000
(Gain) loss on disposal of assets	(413,000)	25,000
Stock-based compensation	263,000	243,000
Changes in assets and liabilities:
Accounts receivable	(308,000)	(59,000)
Costs and estimated earnings in excess of billings	(344,000)	3,448,000
Inventories	453,000	(2,208,000)
Prepaid expenses	(54,000)	(13,000)
Accounts payable	(336,000)	(598,000)
Customer deposits	(1,619,000)	1,463,000
Accrued expenses and other	(1,121,000)	(701,000)
Total adjustments	(5,837,000)	669,000
Cash flows provided by (used in) operations	(2,364,000)	7,394,000
Cash flows from investing activities:
Capital expenditures	(696,000)	(1,198,000)
Proceeds from sale of property and equipment	685,000
Cash flows used in investing activities	(11,000)	(1,198,000)
Cash flows from financing activities:
Proceeds from stock option exercises	11,000
Cash flows provided by financing activities	11,000
Net increase (decrease) in cash	(2,364,000)	6,196,000
Cash and cash equivalents at:
Beginning of year	9,557,000	3,361,000
End of year	$ 7,193,000	$ 9,557,000