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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:    
Net income $ 2,346,000 $ 1,394,000
Adjustments to reconcile net income to cash provided by operating activities:    
Purchases of marketable securities (53,513,000) (177,343,000)
Proceeds from sale and maturity of marketable securities 53,177,000 177,196,000
Change in fair value of marketable securities (118,000) (301,000)
Deferred income taxes (726,000) 46,000
Depreciation and amortization 300,000 310,000
Provision for doubtful accounts   50,000
Stock-based compensation 18,000 18,000
Changes in assets and liabilities:    
Accounts receivable (133,000) 266,000
Costs and estimated earnings in excess of billings 1,041,000 (1,770,000)
Inventories (238,000) (903,000)
Prepaid expenses & other current assets 410,000 62,000
Accounts payable 1,995,000 448,000
Customer deposits (1,315,000) 3,033,000
Accrued expenses 373,000 79,000
Total adjustments 1,271,000 1,191,000
Cash flows provided by operating activities 3,617,000 2,585,000
Cash flows from investing activities:    
Capital expenditures (1,954,000) (252,000)
Cash flows used in investing activities (1,954,000) (252,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 267,000 10,000
Cash flows provided by financing activities 267,000 10,000
Net increase in cash and cash equivalents 1,930,000 2,343,000
Cash and cash equivalents at:    
Beginning of period 22,933,000 18,219,000
End of period $ 24,863,000 $ 20,562,000