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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operations:    
Net income (loss) $ (976,000) $ 875,000
Adjustments to reconcile net income (loss) to cash provided by operating activities:    
Purchases of marketable securities (14,929,000) (5,898,000)
Proceeds from sale and maturity of marketable securities 16,133,000 6,695,000
Change in fair value of marketable securities 632,000 (2,093,000)
Deferred income taxes (835,000) 325,000
Depreciation and amortization 286,000 261,000
Provision for doubtful accounts 40,000 90,000
Stock-based compensation 63,000 46,000
Change in assets and liabilities:    
Accounts receivable 110,000 237,000
Costs and estimated earnings in excess of billings 1,354,000 2,374,000
Inventories (3,188,000) (2,646,000)
Prepaid expenses (203,000) 131,000
Account payable (375,000) 275,000
Customer deposits 3,027,000 2,364,000
Accrued expenses and other (183,000) (438,000)
Total adjustments 1,932,000 1,723,000
Cash flows provided by operating activities 956,000 2,598,000
Cash flows used in investing activities:    
Capital expenditures (25,000) (21,000)
Cash flows used in investing activities (25,000) (21,000)
Net increase in cash and cash equivalents 931,000 2,577,000
Cash and cash equivalents at:    
Beginning of period 3,361,000 1,715,000
End of period $ 4,292,000 $ 4,292,000