Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operations:
Net income (loss)	$ (1,096,000)	$ 446,000
Adjustments to reconcile net income (loss) to cash used in operating activities:
Purchases of marketable securities	(134,896,000)	(13,903,000)
Proceeds from sale and maturity of marketable securities	134,567,000	12,983,000
Change in fair value of marketable securities	433,000	(558,000)
Deferred income taxes	(244,000)	220,000
Depreciation and amortization	325,000	334,000
Stock-based compensation	63,000	59,000
Changes in assets and liabilities:
Accounts receivable	718,000	233,000
Costs and estimated earnings in excess of billings	(2,014,000)	(2,326,000)
Inventories	434,000	95,000
Prepaid expenses & other current assets	(670,000)	(23,000)
Accounts payable	(170,000)	(237,000)
Customer deposits	1,198,000	(816,000)
Accrued expenses	(212,000)	(811,000)
Total adjustments	(468,000)	(4,750,000)
Cash flows used in operating activities	(1,564,000)	(4,304,000)
Cash flows used in investing activities:
Capital expenditures		(251,000)
Cash flows used in investing activities		(251,000)
Net decrease in cash and cash equivalents	(1,564,000)	(4,555,000)
Cash and cash equivalents at:
Beginning of period	7,193,000	9,557,000
End of period	$ 5,629,000	$ 5,002,000