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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operations:    
Net income $ 2,347,000 $ 2,001,000
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Purchases of marketable securities (67,849,000) (27,606,000)
Proceeds from sale and maturity of marketable securities 66,005,000 28,264,000
Change in fair value of marketable securities (809,000) (644,000)
Deferred income taxes 574,000 648,000
Depreciation and amortization 676,000 578,000
Provision for doubtful accounts 15,000 40,000
Stock-based compensation 136,000 124,000
Changes in assets and liabilities:    
Accounts receivable (4,000) (122,000)
Costs and estimated earnings in excess of billings (5,473,000) (121,000)
Inventories 1,379,000 (1,597,000)
Prepaid expenses and other current assets 396,000 (948,000)
Accounts payable 241,000 384,000
Customer deposits (2,000) 2,713,000
Accrued expenses and other (940,000) (40,000)
Total adjustments (5,655,000) 1,673,000
Cash flows provided by (used in) operating activities (3,308,000) 3,674,000
Cash flows used in investing activities:    
Capital expenditures (597,000) (637,000)
Cash flows used in investing activities (597,000) (637,000)
Net increase (decrease) in cash (3,905,000) 3,037,000
Cash and cash equivalents at:    
Beginning of period 9,557,000 3,361,000
End of period $ 5,652,000 $ 6,398,000