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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operations:    
Net income $ 3,205,000 $ 89,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (141,432,000) (213,920,000)
Proceeds from sale and maturity of marketable securities 140,636,000 213,392,000
Change in fair value of marketable securities 105,000 240,000
Deferred income taxes 538,000 (303,000)
Depreciation and amortization 720,000 668,000
Loss on disposal of property and equipment (10,000)  
Provision for doubtful accounts 30,000 10,000
Stock-based compensation 16,000 127,000
Changes in assets and liabilities:    
Accounts receivable (666,000) (658,000)
Costs and estimated earnings in excess of billings 7,000 (2,000,000)
Inventories (1,075,000) 387,000
Prepaid expenses and other current assets 263,000 (47,000)
Accounts payable 891,000 987,000
Customer deposits 2,356,000 4,335,000
Accrued expenses 391,000 (229,000)
Total adjustments 2,770,000 2,989,000
Cash flows provided by operating activities 5,975,000 3,078,000
Cash flows used in investing activities:    
Capital expenditures (85,000) (261,000)
Cash flows used in investing activities (85,000) (261,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 101,000  
Cash flows from financing activities 101,000  
Net increase in cash 5,991,000 2,817,000
Cash and cash equivalents at:    
Beginning of period 11,152,000 7,193,000
End of period $ 17,143,000 $ 10,010,000