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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:    
Net income $ 1,394,000 $ 1,575,000
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Purchases of marketable securities (177,343,000) (51,115,000)
Proceeds from sale and maturity of marketable securities 177,196,000 50,619,000
Change in fair value of marketable securities (301,000) (482,000)
Deferred income taxes 46,000 299,000
Depreciation and amortization 310,000 362,000
Provision for doubtful accounts 50,000 5,000
Stock-based compensation 18,000 5,000
Changes in assets and liabilities:    
Accounts receivable 266,000 (150,000)
Costs and estimated earnings in excess of billings (1,770,000) (1,648,000)
Inventories (903,000) (2,301,000)
Prepaid expenses & other current assets 62,000 (125,000)
Accounts payable 448,000 339,000
Customer deposits 3,033,000 1,717,000
Accrued expenses 79,000 135,000
Total adjustments 1,191,000 (2,340,000)
Cash flows provided by (used in) operating activities 2,585,000 (765,000)
Cash flows from investing activities:    
Capital expenditures (252,000) (29,000)
Cash flows used in investing activities (252,000) (29,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 10,000  
Cash flows provided by financing activities 10,000  
Net increase (decrease) in cash and cash equivalents 2,343,000 (794,000)
Cash and cash equivalents at:    
Beginning of period 18,219,000 11,152,000
End of period $ 20,562,000 $ 10,358,000